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 #245 (293b902) into master (53af207) will decrease coverage by 0.01%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master     #245      +/-   ##
============================================
- Coverage     71.53%   71.52%   -0.02%     
- Complexity     1021     1022       +1     
============================================
  Files           122      122              
  Lines          6233     6234       +1     
  Branches       1062     1067       +5     
============================================
  Hits           4459     4459              
- Misses         1339     1342       +3     
+ Partials        435      433       -2     

Impacted Files	Coverage Δ	Complexity Δ
...h_listener_ldap_user_store_basic_auth_provider.bal	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...allerina/auth_client_bearer_token_auth_handler.bal	87.50% <66.66%> (-12.50%)	0.00 <0.00> (ø)
grpc-ballerina/auth_client_basic_auth_handler.bal	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
grpc-ballerina/auth_client_oauth2_handler.bal	90.00% <100.00%> (ø)	0.00 <0.00> (ø)
...erina/auth_client_self_signed_jwt_auth_handler.bal	90.00% <100.00%> (ø)	0.00 <0.00> (ø)
grpc-ballerina/auth_listener_jwt_auth_handler.bal	85.00% <100.00%> (ø)	0.00 <0.00> (ø)
grpc-ballerina/auth_listener_oauth2_handler.bal	83.33% <100.00%> (ø)	0.00 <0.00> (ø)
grpc-ballerina/client_endpoint.bal	85.50% <0.00%> (-1.45%)	0.00% <0.00%> (ø%)
...main/java/org/ballerinalang/net/grpc/GrpcUtil.java	51.59% <0.00%> (-0.46%)	22.00% <0.00%> (ø%)
... and 1 more

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