refactor(open api gateway): improve project structure

[cogwirrel]

• Move the spec dir into src
• Remove projen project files from spec "project" (unfortunately this needed to be a project so I could make use of SampleFile and synth components early, so I did a bit of a hack to remove the default project files)
• Rename default parsed spec to .parsed-spec.json
• BREAKING CHANGE: Combined specDir and specFileName into a single specFile parameter

This gives the following overall structure:

|_ src/
    |_ index.ts
    |_ spec/
        |_ spec.yaml
        |_ .parsed-spec.json
    |_ api/
        |_ index.ts
        |_ api.ts
        |_ sample-api.ts
        |_ sample-api.say-hello.ts
|_ generated/
    |_ typescript/

[nx-cloud]

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