Announces support for unsupported code lenses

[rchl]

Client making a request and failing:

:: --> terraform textDocument/codeLens(3): {'textDocument': {'uri': 'file:///.../infra/app.tf'}}
:: <~~ terraform 3: {'message': 'no such method "textDocument/codeLens"', 'code': -32601}

[github-actions]

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