Add PNPM package manager support

[nartuk]

Implement PNPM build info collection with dependency parsing, lock file handling, and test coverage.

Related to feature request: RTECO-366

Required for:

• Add PNPM package manager support jfrog-cli-core#1519
• Add PNPM package manager support jfrog-cli-artifactory#362
• Add PNPM package manager support jfrog-cli#3342

Notes on NPM-Identical Patterns

The following patterns are intentionally kept identical to the NPM implementation for consistency:

1. filterPnpmArgsFlags loop structure (matches filterNpmArgsFlags)
2. Module type uses entities.Npm (no separate PNPM constant)
3. Scope detection logic in getScopes (mirrors NPM behavior)

These can be addressed in a future PR that updates both NPM and PNPM together if needed.

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