CFn: fix reserved python keyword usage in scaffolding plugin

[simonrw]

Motivation

There was an issue when generating the Lambda resources. It would generate an import path containing the word "lambda", which is a reserved keyword in Python. The actual failure was when trying to run black over the codebase.

Changes

• Use python compatible name for module
• Sort resource provider list to reduce the number of merge conflicts
• Add option to not run black, since running black is a common source of errors. It checks the code is valid Python, but sometimes you just want to scaffold a resource and fix the issues yourself. Black will be run on the resulting file anyway.

Testing

python -m localstack.services.cloudformation.scaffold generate -r "AWS::Lambda::Version" should work

[coveralls]

coverage: 82.442% (+0.01%) from 82.431% when pulling 709134a on cfn/fix/scaffolding-reserved-keyword into 64ca50f on master.

[github-actions]

LocalStack Community integration with Pro

       2 files         2 suites   1h 8m 24s ⏱️
2 288 tests 1 708 ✔️ 580 💤 0 ❌
2 289 runs  1 708 ✔️ 581 💤 0 ❌

Results for commit 709134a.