Allow sub organization applications to issue tokens to access the resources in sub organizations

[ShanChathusanda93]

Proposed changes in this pull request

• $subject
• Improvement for : Support for creating OAuth 2.0 clients inside B2B organizations for B2B API access wso2/product-is#21208
• OAuth2 application creation will be enabled from Allow OAuth2 application management through DCR in sub organizations #2578
• This improvement will enable the token issuance from those applications through the token endpoint with the following format
  /t/{tenant-domain}/o/{org-id}/oauth2/token?scope=openid...
• Following grant types will be supported in this phase.
  • client_credentials
  • password
  • refresh_token

When should this PR be merged

• Need a kernel level improvement to be merged first and release a kernel version : Introduce application resident organization in carbon context wso2/carbon-kernel#4104
  • Kernel version bump is done in [1] and please make sure that before merging this PR, merge [1].

[1] #2578

[Thumimku]

Hi @ShanChathusanda93,

⚠️ Notice: This PR has been open for a while. To keep the repository clean and up-to-date, this PR will be closed within the next two weeks if there is no further activity.

Please take one of the following actions:

• Merge the PR if it is ready.
• Close the PR if it is no longer relevant.
• Leave a comment explaining why it should remain open and provide an update on its progress.

Your prompt attention to this matter is greatly appreciated. Thank you for your understanding and collaboration! 🙏

[ShanChathusanda93]

Hi @ShanChathusanda93,

⚠️ Notice: This PR has been open for a while. To keep the repository clean and up-to-date, this PR will be closed within the next two weeks if there is no further activity.

Please take one of the following actions:

• Merge the PR if it is ready.
• Close the PR if it is no longer relevant.
• Leave a comment explaining why it should remain open and provide an update on its progress.

Your prompt attention to this matter is greatly appreciated. Thank you for your understanding and collaboration! 🙏

This PR is WIP and will be completed withing next couple of days.