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