Add entrypoint filtering to and Deployment, Configuration, and Inspect APIs

[dotNomad]

To allow the flow we want for selecting and deploying from a button on entrypoint files we need some APIs to support filtering by entrypoint.

The API endpoints are:

• api/inspect
• api/deployments
• api/configurations

The design is currently to use an optional query parameter to modify the default behavior. ?entrypoint=path can be passed with the path being a relative path to a specific endpoint file.

The response will contain only resources related to that entrypoint.

In the case of the:

• inspect API only potential Configurations with that entrypoint will be returned
• Deployments only Deployments with Configurations using that entrypoint will be returned
• Configurations using that entrypoint will be returned

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Part of the #1846 epic.

[mmarchetti]

See the note in https://github.com/posit-dev/publisher/pull/1916#discussion_r1661579320. The entrypoint matching test will need to be more complex since the entrypoint parameter will be relative to the workspace root, and might be a path into a subdirectory.