Rename LDAP user store auth handler

[ldclakmal]

Purpose

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

Checklist

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

[codecov]

Codecov Report

Merging #282 (b67256e) into master (dfd1174) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #282      +/-   ##
============================================
+ Coverage     74.52%   74.53%   +0.01%     
  Complexity     1062     1062              
============================================
  Files           121      121              
  Lines          6280     6280              
  Branches       1083     1083              
============================================
+ Hits           4680     4681       +1     
+ Misses         1175     1174       -1     
  Partials        425      425              

Impacted Files	Coverage Δ
...th_listener_ldap_user_store_basic_auth_handler.bal	0.00% <0.00%> (ø)
grpc-ballerina/client_endpoint.bal	86.95% <0.00%> (+1.44%)	⬆️

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