Fixes: #3522

This PR concludes the autogenerating docs initiative with a basic Swagger validator and custom rules, that will let us keep the better quality of docs. The validator uses go/ast to parse comments and Go structure fields. It covers OSS and Enterprise chi handlers.

Checks:

1. Ensure consistency between @Summary and @ID.
2. Verify @Success and/or @Failure.
3. Verify presence of required annotations.
4. Make sure that Go comment (above the function) is before swagger's @...
5. Ensure that path parameters are defined.
6. Ensure that @Security tag is present.
7. Verify @Accept annotation.
8. Verify @Produce annotation.
9. Ensure unique swagger routes - no copy/paste mistakes.
10. Make sure that uuid.UUID and time.Time fields are formatted.

To reviewer:

• There are many files in this PR, mainly due to minor fixes spotted while implementing the validator. I suggest starting the peer review with coderdtest/swaggerparser.go.