SUBMARINE-1140. Some fixes for auto generating python from swagger

[atosystem]

What is this PR for?

1. Fix ./dev-support/pysubmarine/gen-sdk.sh for cross platform issue
2. Fix ./dev-support/pysubmarine/gen-sdk.sh for wrong auto-format path
3. Fix Bootstrap.java for generating API specs for notebook, experiment and environment together.
4. Update readme(./website/docs/userDocs/submarine-sdk/pysubmarine/developmend.md) for a more detailed description for using swagger.

What type of PR is it?

[Improvement]

Todos

• Edit java code

What is the Jira issue?

https://issues.apache.org/jira/projects/SUBMARINE/issues/SUBMARINE-1140

How should this be tested?

Screenshots (if appropriate)

Questions:

• Do the license files need updating? No
• Are there breaking changes for older versions? No
• Does this need new documentation? Yes

[KUAN-HSUN-LI]

+1

[KUAN-HSUN-LI]

Thanks for contributing to this feature. Can you also provide a test to check if there is a mismatch between the Python API and Java API? (Just like what they do in the operator)