--write: add utils for dumping Jinja from AST

[cognifloyd]

TODO:

• [ ] Improve dumping templates that need to be wrapped due to length

• [ ] Add more test cases

• [ ] Reword the PR description

• Add jinja TemplateDumper

• Add some basic tests and dump() func

• Add tests for jinja operators

• Better type hints

• Unused imports

• Ignore pycharm false positive warnings

• Simplify TemplateDumper signature

• reformat with black

• flake8 required fixes

• Add more typehints to satisfy mypy

• simplify elif/else after return or continue for pylint

• disable false positive pylint checks

• Add new lines after blocks in Jinja template dumper

• Consolidate jinja dumper write_block_stmt logic

• better write_block_stmt

• make sphinx happy

• format transform_utils docstrings for sphinx

• tell sphinx to ignore more classes

• Fix newlines in Jinja template dumper

• Correct test for newline feature in TemplateDumper

• Use . instead of [] for getitem dumping in simple cases

• Add TODO about protected name attributes