Address new changes in captcha specification

[pkong-ds]

Spec ref #4282

What's in this PR?

• [x] Update captcha configuration
  • [x] ~Support id_allowlist~ To be implemented
  • [x] Support mode (only always & never)
  • [x] Remove captcha.enabled from authflow root
• [x] ~Introduce new risk_assessment configuration~ To be implemented
  • [x] ~The Go structs~
  • [x] ~The JSON schema~
  • [x] ~Write tests to test for valid and invalid configurations~
• [x] ~Add risk_assessment configuration to the root of each flow type configuration~
  • [x] ~Add risk_assessment configuration to the branches of identify, create_authenticator, and authenticate~
  • [ ] ~When generating the default flows, take risk_assessment configuration into account. Refer to the spec for the details of the behavior~
  • [ ] ~Write tests for the generated flows.~

~Last 2 items pending in https://github.com/authgear/authgear-server/pull/4282/files#r1646534742~

New Changes as of June 21

• [x] rename captcha as bot_protection
• [x] Misc config schema updates
• [x] Updates on all test cases

EDIT: Cross out to be implemented items

EDIT 2: Added new section

[pkong-ds]

@louischan-oursky updated, thanks!

[pkong-ds]

This became WIP because spec updated 🙏

[pkong-ds]

@louischan-oursky local test & ci pass, feel free to review :adore:

[pkong-ds]

updated, thanks!

Added 2 commits, starting from 9c41c18

[pkong-ds]

@louischan-oursky updated, thanks! local ci & e2e passed :adore: