Categorize built-ins / expose reserved name built-ins

[Buckwich]

Closes #11
Related to camunda/camunda-modeler#3983

Proposed Changes

• Some refactoring (code splitting) (first commit)
• try to parse the functions with lezer-feel, add problematic functions to a separate list (enabler for get or else Camunda FEEL function is marked as syntax error camunda-modeler#3983)
• separate feel builtins from camunda extension (Closes Separate Camunda Extension from default builtins #11)

So far only get or else is an unparsable function. but with this we can detect more in the future.

Checklist

To ensure you provided everything we need to look at your PR:

• Brief textual description of the changes present
• Visual demo attached
• Steps to try out present, i.e. using the @bpmn-io/sr tool
• Related issue linked via Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}

[Copilot]

Pull request overview

This PR restructures the exported FEEL builtin collections to separate standard FEEL builtins from Camunda-specific extensions, and adds a build-time step to detect functions that are not parsable by lezer-feel (supporting downstream editor/lint integrations).

Changes:

• Split exports into feelBuiltins, camundaExtensions, camundaBuiltins (combined), plus unparsableBuiltins.
• Refactor the builtin compilation task into smaller utilities (markdown parsing, categorization, template writing) and add lezer-feel-based parsability detection.
• Update README, typings, and tests to reflect the new exports.

Reviewed changes

Copilot reviewed 12 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tsconfig.json	Enables skipLibCheck for TS checking.
package.json	Adds @bpmn-io/lezer-feel dependency for parsability detection during compilation.
package-lock.json	Locks new dependency tree for @bpmn-io/lezer-feel.
tasks/compileBuiltins.js	Uses new utils + categorization and writes categorized outputs via template.
tasks/camundaBuiltins.template.js	Template now defines separate exports and composes camundaBuiltins.
tasks/utils/index.js	Barrel export for the new task utilities.
tasks/utils/markdownParser.js	New markdown parsing utility extracted from compile script.
tasks/utils/parseBuiltins.js	Updates JSDoc types to use the new markdown parser typedef.
tasks/utils/categorizeBuiltins.js	Adds Lezer-based parsability detection and categorization logic.
tasks/utils/templateWriter.js	New utility to write categorized lists into the JS template.
src/index.js	Exposes the new public exports.
src/camundaBuiltins.js	Regenerated output containing split builtin collections and unparsables list.
dist/index.d.ts	Updates public typings for new exports.
test/spec/lib/camundaBuiltins.spec.js	Adds test coverage for the new exports and relationships.
README.md	Documents the new exports and suggested usage.

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[Copilot]

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[nikku]

Some comments attached, sorry for potential double posts (due to GitHub hick-ups).

[nikku]

Good one ⭐

[nikku]

Thanks again, released as v0.4.0.