Make JWT auth providers 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 #240 (a8c2cb3) into master (e7ee473) will decrease coverage by 0.23%.
The diff coverage is 84.61%.

@@             Coverage Diff              @@
##             master     #240      +/-   ##
============================================
- Coverage     82.99%   82.76%   -0.24%     
  Complexity       31       31              
============================================
  Files            11       11              
  Lines           641      644       +3     
  Branches        305      307       +2     
============================================
+ Hits            532      533       +1     
- Misses          102      104       +2     
  Partials          7        7              

Impacted Files	Coverage Δ	Complexity Δ
...ballerina/client_self_signed_jwt_auth_provider.bal	80.00% <66.66%> (-8.89%)	0.00 <0.00> (ø)
jwt-ballerina/listener_jwt_auth_provider.bal	82.60% <90.00%> (-0.98%)	0.00 <0.00> (ø)

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