expose a public API methods from this extension

[lonhutt]

• this plugin now returns an ExtensionAPI object with (currently) a single method that parses the project .bazelproject and returns a BazelProjectView object.
• this is to allow other dependent extensions the ability to get the current state of the bazel project view without having to duplicate our parsing code
• Added a test to validate the public methods returns some value

[github-actions]

Test Results

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Results for commit 102f00e.

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