feat: added imperative get support for system-accounts

[Prashansa-K]

Summary

In this PR, we are adding get and list support for
system-account resources.
As the underlying API doesn't support labels yet,
we are just supporting read operations over these
resources.

Operations supported:

• list, list by name
• get (== list if no args are passed)
• get by name, id

Issues resolved

For #258

Documentation

• Link to the website documentation PR

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

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[Copilot]

Pull request overview

This pull request adds imperative get support for system accounts in the Konnect CLI, allowing users to retrieve and list system account information through direct commands.

Changes:

• Added SystemAccountsAPI interface and implementation in the helpers package for SDK abstraction
• Implemented get system_account command with support for listing all system accounts and fetching by ID or name
• Integrated the new command into the root-level get verb for direct access

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/konnect/helpers/system_accounts.go	Defines the SystemAccountsAPI interface and implementation for listing and getting system accounts
internal/konnect/helpers/sdk_mock.go	Adds mock factory support for SystemAccountsAPI testing
internal/konnect/helpers/sdk.go	Registers the SystemAccountsAPI getter in the main SDK interface
internal/cmd/root/verbs/get/system_account.go	Creates the direct system account command with Konnect-specific flag bindings
internal/cmd/root/verbs/get/get.go	Integrates the system account command into the root get verb
internal/cmd/root/products/konnect/system_account/system_account.go	Defines the system account command structure with metadata and aliases
internal/cmd/root/products/konnect/system_account/getSystemAccount.go	Implements the core logic for listing and getting system accounts with pagination support

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