ADFA-4612: Add code action to implement abstract members

[itsaky-adfa]

Jira: ADFA-4612

What & why

On a concrete class/object that does not implement all required members, adds a code action that generates override stubs for the abstract functions and properties. Diagnostic-free: recomputes from the enclosing declaration via a fresh analysis session (no dependency on diagnostics).

Stub text is emitted fully indented (code-action edits bypass the editor's auto-indent), with the indent unit detected from context (existing members, else the file's predominant indent, else a tab). Handles generics with bounds, multiple supertypes (collapsed to one signature), extension receivers, and varargs. Bodies use TODO("Not yet implemented").

Tests

:lsp:kotlin:testV7DebugUnitTest - AbstractMemberStubsTest + ImplementMembersEndToEndTest green (functions, val/var properties, generics incl. bounded, suspend, multiple supertypes, already-implemented no-op, and exact resulting-text insertion cases). :lsp:kotlin:assembleV8Debug builds. Spotless can't run in the worktree; formatting hand-verified.

Notes

The action is always-visible (like OrganizeImportsAction); computing applicability precisely would need an analysis session, too costly for a synchronous visibility gate. Only cross-branch overlap is the KotlinCodeActionsMenu list append (trivial keep-both).

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e8007401-87c9-4ade-83dd-3fa8bb643101

📥 Commits

Reviewing files that changed from the base of the PR and between 8077407 and 4cd34d6.

📒 Files selected for processing (6)

• lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/KotlinCodeActionsMenu.kt
• lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/actions/ImplementMembersAction.kt
• lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/utils/AbstractMemberStubs.kt
• lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/utils/AbstractMemberStubsTest.kt
• lsp/kotlin/src/test/java/com/itsaky/androidide/lsp/kotlin/utils/ImplementMembersEndToEndTest.kt
• resources/src/main/res/values/strings.xml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/ADFA-4612

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