Integrate IdentityKeyStoreResolver

[Binara-Sachin]

Purpose

• This PR integrates the IdentityKeyStoreResolver class into the OAuth flow.
• This will allow users to define custom key stores to be used in the authentication flow.

Important

• Before merging this PR,
  • Carbon Kernel version should be bumped
  • Following PRs should be merged,
    • Add Capability to retrieve Custom KeyStores wso2/carbon-kernel#4025
    • Add IdentityKeyStoreResolver and Util Classes wso2/carbon-identity-framework#5794

---

• Problem Statement: https://github.com/wso2-enterprise/iam-product-management/issues/67
• Public Git Issue: Capability to Configure Custom KeyStores for All Inbound Authentication Protocols wso2/product-is#20564

[CLAassistant]

All committers have signed the CLA.

[Thumimku]

How we plan to handle token-exchange/Org switch when we have different keystores, we have to update those source code also right?

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 10 lines in your changes missing coverage. Please review.

Project coverage is 55.72%. Comparing base (04da85a) to head (ffd7c83).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...identity/oauth2/authcontext/JWTTokenGenerator.java	0.00%	4 Missing ⚠️
...org/wso2/carbon/identity/oauth2/util/JWTUtils.java	0.00%	4 Missing ⚠️
...g/wso2/carbon/identity/oauth2/util/OAuth2Util.java	80.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2524      +/-   ##
============================================
- Coverage     56.12%   55.72%   -0.41%     
- Complexity     8092     8227     +135     
============================================
  Files           632      632              
  Lines         46016    47000     +984     
  Branches       7520     7767     +247     
============================================
+ Hits          25827    26191     +364     
- Misses        16472    17000     +528     
- Partials       3717     3809      +92     

Flag	Coverage Δ
unit	38.12% <58.33%> (+0.05%)	⬆️

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