feat(logging): split GAPIC from the logging handwritten package

[quirogas]

Decouple the handwritten Logging wrapper from the auto-generated GAPIC client layer by importing a standalone version of the GAPIC library. Standalone -api packages are now generated and maintained independently.

• Removed embedded GAPIC generated code (src/v2/) and OwlBot files (owlbot.py, .OwlBot.yaml).
• Added dependency on standalone @google-cloud/logging-api (^0.2.0).
• Re-exported v2 and protos directly from @google-cloud/logging-api.
• Preserved top-level and namespace access to all v2 GAPIC sub-clients (LoggingServiceV2Client, ConfigServiceV2Client, MetricsServiceV2Client).

Internal: b/531788771

[gemini-code-assist]

Code Review

This pull request removes auto-generated GAPIC client files and configurations, transitioning the internal ./v2 module to an external dependency on @google-cloud/logging-api. Feedback suggests replacing the require statement for @google-cloud/logging-api with an ES6 import in src/index.ts to preserve TypeScript type safety and eliminate the need for an ESLint suppression comment.

[gemini-code-assist]

Using 'require' to import '@google-cloud/logging-api' forces the use of an 'eslint-disable' comment and types 'v2' as 'any', which bypasses TypeScript's type safety. Since '@google-cloud/logging-api' is now an external dependency, it can be cleanly imported using ES6 'import' syntax to preserve type safety and eliminate the lint warning suppression.

Suggested change

	// eslint-disable-next-line @typescript-eslint/no-var-requires
	const v2 = require('./v2');
	const v2 = require('@google-cloud/logging-api');
	import * as v2 from '@google-cloud/logging-api';