Why are these changes needed?
Add API stability annotations for datasource classes, and add a linter to check all data classes have appropriate annotations.
The `black` version string differs based on installation method. On my (m1) laptop:
```
$ black --version
black, version 21.7b0
```
On @simon-mo's (intel) and @shrekris-anyscale's (m1) laptops:
```
$ black --version
black, 21.12b0 (compiled: no)
```
This adds a conditional in `ci/lint/format.sh` to handle both.
The recursive grep in the banned words check can get really messy when running locally depending on each person's directory structure or where the format script is being called from.
Separates the banned words check as a separate script so that it's not called by default in ./format.sh. Also adds this to the documentation
Clean up the ci/ directory. This means getting rid of the travis/ path completely and moving the files into sensible subdirectories.
Details:
- Moves everything under ci/travis into subdirectories, e.g. ci/build, ci/lint, etc.
- Minor adjustments to some scripts (variable renames)
- Removes the outdated (unused) asan tests
