feat: Api logic implementation

[iresharma]

Summary of change

Email password login for dashboard recipe

Related issues

supertokens/dashboard#55

Test Plan

All existing tests pass

Documentation changes

None

Checklist for important updates

• Changelog has been updated
• coreDriverInterfaceSupported.json file has been updated (if needed)
  • Along with the associated array in supertokens_python/constants.py
• frontendDriverInterfaceSupported.json file has been updated (if needed)
• Changes to the version if needed
  • In setup.py
  • In supertokens_python/constants.py
• Had installed and ran the pre-commit hook
• Issue this PR against the latest non released version branch.
  • To know which one it is, run find the latest released tag (git tag) in the format vX.Y.Z, and then find the latest branch (git branch --all) whose X.Y is greater than the latest released tag.
  • If no such branch exists, then create one from the latest released branch.
• If have added a new web framework, update the supertokens_python/utils.py file to include that in the FRAMEWORKS variable
• If added a new recipe that has a User type with extra info, then be sure to change the User type in supertokens_python/types.py

Remaining TODOs for this PR

• Interface and routing - Feat: Interface and routing for email-password login #290
• API logic

[KShivendu]

Good enough for the first time. I left some comments please check if those mistakes are repeated elsewhere in the code :)

[KShivendu]

Dropped some more comments. Please validate the changes with the corresponding Node PR. Also, remember to manually test the flow at least once.

[KShivendu]

Needs an equivalent of sessionDeleteResponse.