Initial enhancement proposal template (#10539)

Author: npolshakova

docs/content/enhancements/template.md

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+<!--
+**Note:** When your Enhancement Proposal (EP) is complete, all of these comment blocks should be removed.
+
+This template is inspired by the Kubernetes Enhancement Proposal (KEP) template: https://github.com/kubernetes/enhancements/blob/master/keps/sig-architecture/0000-kep-process/README.md
+
+To get started with this template:
+
+- [ ] **Create an issue in kgateway-dev/kgateway**
+- [ ] **Make a copy of this template.**
+  `EP-[ID]: [Feature/Enhancement Name]`, where `ID` is the issue number (with no
+  leading-zero padding) assigned to your enhancement above.
+- [ ] **Fill out this file as best you can.**
+  At minimum, you should fill in the "Summary" and "Motivation" sections.
+- [ ] **Create a PR for this EP.**
+  Assign it to maintainers with relevant context.
+- [ ] **Merge early and iterate.**
+  Avoid getting hung up on specific details and instead aim to get the goals of
+  the EP clarified and merged quickly. The best way to do this is to just
+  start with the high-level sections and fill out details incrementally in
+  subsequent PRs.
+
+Just because a EP is merged does not mean it is complete or approved. Any EP
+marked as `provisional` is a working document and subject to change. You can
+denote sections that are under active debate as follows:
+
+```
+<<[UNRESOLVED optional short context or usernames ]>>
+Stuff that is being argued.
+<<[/UNRESOLVED]>>
+```
+
+When editing EPS, aim for tightly-scoped, single-topic PRs to keep discussions
+focused. If you disagree with what is already in a document, open a new PR
+with suggested changes.
+
+One EP corresponds to one "feature" or "enhancement" for its whole lifecycle. Once a feature has become
+"implemented", major changes should get new EPs.
+-->
+# EP-[ID]: [Feature/Enhancement Name] 
+
+<!--
+This is the title of your EP. Keep it short, simple, and descriptive. A good
+title can help communicate what the EP is and should be considered as part of
+any review.
+-->
+
+* Issue: [#ID](URL to GitHub issue)
+
+<!--
+A table of contents is helpful for quickly jumping to sections of a EP and for
+highlighting any additional information provided beyond the standard EP
+template.
+
+Ensure the TOC is wrapped with
+  <code>&lt;!-- toc --&rt;&lt;!-- /toc --&rt;</code>
+tags, and then generate with `hack/update-toc.sh`.
+-->
+
+## Background 
+
+<!-- 
+Provide a brief overview of the feature/enhancement, including relevant background information, origin, and sponsors. 
+Highlight the primary purpose and how it fits within the broader ecosystem.
+
+Include Motivation, concise overview of goals, challenges, and trade-offs.
+
+-->
+
+## Motivation
+
+<!--
+This section is for explicitly listing the motivation, goals, and non-goals of
+this EP. Describe why the change is important and the benefits to users. The
+motivation section can optionally provide links to [experience reports] to
+demonstrate the interest in a EP within the wider Kubernetes community.
+
+[experience reports]: https://github.com/golang/go/wiki/ExperienceReports
+-->
+
+### Goals
+
+<!--
+
+List the specific goals of the EP. What is it trying to achieve? How will we
+know that this has succeeded?
+
+Include specific, actionable outcomes. Ensure that the goals focus on the scope of
+the proposed feature.
+-->
+
+
+### Non-Goals 
+
+<!--
+What is out of scope for this EP? Listing non-goals helps to focus discussion
+and make progress.
+-->
+
+## Implementation Details
+
+<!--
+This section should contain enough information that the specifics of your
+change are understandable. This may include API specs (though not always
+required) or even code snippets. If there's any ambiguity about HOW your
+proposal will be implemented, this is the place to discuss them.
+
+
+### Configuration
+Specify changes to any configuration APIs, CRDs, or user-facing options to enable/disable
+the feature. Include references to relevant files or configurations that need updates.
+
+### Plugin
+Describe how the feature will be added as a plugin (if applicable).
+Include references to existing plugin frameworks or structures.
+Highlight the plugin's responsibilities and integration points.
+
+### Controllers
+Outline the responsibilities of new or updated controllers.
+Specify conditions for their operation and integration with existing resources.
+Mention required RBAC updates or new permissions.
+
+### Deployer
+Detail deployment-specific updates, e.g., Helm chart modifications, custom deployer changes, etc.
+Include any prerequisites or dependencies for deployment.
+
+### Translator and Proxy Syncer
+Specify updates to translators, syncers, or other intermediary components.
+Highlight how these components interact with the feature's resources or backend.
+
+### Reporting
+Describe changes to status reporting or monitoring frameworks.
+Include any caveats or limitations in initial reporting.
+-->
+
+### Test Plan 
+
+<!--
+    Define the testing strategy for the feature.
+    Include unit, integration, and end-to-end (e2e) tests.
+    Specify any additional frameworks or tools required for testing.
+-->
+
+## Alternatives
+
+<!--
+Highlight potential challenges or trade-offs.
+-->
+
+## Open Questions
+
+<!--
+Include any unresolved questions or areas requiring feedback.
+-->