Make auth handlers isolated

[ldclakmal]

Purpose

$subject
Related to ballerina-platform/ballerina-library#584

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #407 (f6eeac1) into master (4a60e3b) will increase coverage by 31.05%.
The diff coverage is 83.33%.

@@              Coverage Diff              @@
##             master     #407       +/-   ##
=============================================
+ Coverage     45.73%   76.78%   +31.05%     
+ Complexity     1811       62     -1749     
=============================================
  Files           268      319       +51     
  Lines         12127    16255     +4128     
  Branches       1412     3738     +2326     
=============================================
+ Hits           5546    12482     +6936     
+ Misses         6097     3054     -3043     
- Partials        484      719      +235     

Impacted Files	Coverage Δ	Complexity Δ
...h_listener_ldap_user_store_basic_auth_provider.bal	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...allerina/auth_client_bearer_token_auth_handler.bal	91.66% <66.66%> (ø)	0.00 <0.00> (?)
http-ballerina/auth_client_basic_auth_handler.bal	86.95% <100.00%> (ø)	0.00 <0.00> (?)
http-ballerina/auth_client_oauth2_handler.bal	86.95% <100.00%> (ø)	0.00 <0.00> (?)
...erina/auth_client_self_signed_jwt_auth_handler.bal	86.95% <100.00%> (ø)	0.00 <0.00> (?)
...th_listener_file_user_store_basic_auth_handler.bal	95.83% <100.00%> (ø)	0.00 <0.00> (?)
http-ballerina/auth_listener_jwt_auth_handler.bal	96.00% <100.00%> (ø)	0.00 <0.00> (?)
http-ballerina/auth_listener_oauth2_handler.bal	87.87% <100.00%> (ø)	0.00 <0.00> (?)
...mpl/listener/states/http2/ReceivingEntityBody.java	55.00% <0.00%> (-15.00%)	0.00% <0.00%> (-8.00%)
http-ballerina/auth_desugar.bal	87.50% <0.00%> (ø)	0.00% <0.00%> (?%)
... and 176 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4a60e3b...f6eeac1. Read the comment docs.