Add IntelliJAspectStrategy for the new IntelliJ aspect

[LeFrosch]

Adds a new aspect strategy (IntelliJAspectStarategy) for the new Intllij aspect (https://github.com/JetBrains/intellij-aspect).

The new aspect is disabled by default but can be enabled with the bazel.sync.use.intellij.aspect registry key or form the command line for testing with --//clwb:use_intellij_aspect=true flag.

[gemini-code-assist]

Code Review

This pull request introduces a new IntelliJ split aspect strategy (intellij_aspect_sdk) to replace the legacy bundled aspect, refactoring AspectStrategy to support multiple strategies via providers. It cleans up the codebase by removing legacy aspect-related classes, custom Kotlin patches, and several local proto definitions in favor of the SDK's protos. Feedback on the changes highlights a compilation error in IntelliJAspectWriter.kt due to a type mismatch in WorkspaceRoot.relativize, and suggests replacing getOrNull() with standard Java orElse(null) in IntelliJAspectStrategy.kt to avoid JVM-specific imports.

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[gemini-code-assist]

The WorkspaceRoot.relativize method typically expects a File rather than a Path, and returns a WorkspacePath instead of a standard java.nio.file.Path. Since deployAspectZip expects a Path for relativeDestination, calling workspaceRoot.relativize(normalized) will cause a compilation error. Relativizing on workspaceRoot.path() (which is a Path) resolves this type mismatch.

Suggested change

	relativeDestination = workspaceRoot.relativize(normalized),
	relativeDestination = workspaceRoot.path().relativize(normalized),

[gemini-code-assist]

Using getOrNull() on Optional requires importing kotlin.jvm.optionals.getOrNull which is JVM-specific and requires Kotlin 1.8+. Using the standard Java orElse(null) is cleaner, more compatible, and allows you to remove the unused import on line 30.

Suggested change

	val aspects = Aspects.forRules(toAspectRules(activeLanguages)).mapNotNull { aspect ->
	resolve(project, "${aspect.pkg}/${aspect.file}").map { "$it%${aspect.aspect}" }.getOrNull()
	}
	val aspects = Aspects.forRules(toAspectRules(activeLanguages)).mapNotNull { aspect ->
	resolve(project, "${aspect.pkg}/${aspect.file}").map { "$it%${aspect.aspect}" }.orElse(null)
	}