Support specifying a path for API requests

[dotNomad]

Several APIs need to be able to specify a path to support nested folder deploying flows in the VSCode extension.

The proposed solution is to have:

• an optional query param ?dir=path
• pass an optional path in the body of the request for applicable responses

The APIs that need adjustments:

• GET /api/configurations
• All /api/configurations/$name API endpoints since non-root named Configurations will need a path alongside to be identified
• ALL /api/packages API endpoints since configurations or file creation needs to know the non-root directory
• POST and DEL /api/deployments/$name API endpoints need a path for non-root deployments and configurations

Note

The entrypoint query parameter mentioned in #1847 will not work alongside the dir query param.

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Part of the #1849 epic

[dotNomad]

@mmarchetti I'm taking a look and I'm not seeing support for dir in the /api/packages/python/scan or /api/packages/r/scan endpoints. Am I missing it?

[mmarchetti]

Am I missing it?

Nope, I missed it. See https://github.com/posit-dev/publisher/pull/1919