chore: revert back to ep v0.6

[huaweigu]

Summary

This PR also includes the 712 work on legacy contracts AND enshrining token receiver on MSCA v0.7.
note: this PR is on circlefin:entry-point-v0.6

Detail

Changeset

• revert back to entry point v0.6
• rework 712 on some contracts
• enshrine token receiver on MSCA v0.7

Checklist

• Did you add new tests and confirm all tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the docs folder)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint) and fix any issues?
• Did you run formatter (yarn format:check) and fix any issues (yarn format:write)?

Testing

• updated the tests due to ep update
• added new tests for 712 work

Documentation

n/a