Add missing HTTP status codes

[chamil321]

Purpose

$subject

Fixes ballerina-platform/ballerina-library#3393

Examples

Checklist

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

[codecov]

Codecov Report

Base: 81.24% // Head: 81.34% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (3c98573) compared to base (a688447).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1238      +/-   ##
============================================
+ Coverage     81.24%   81.34%   +0.09%     
  Complexity       71       71              
============================================
  Files           360      360              
  Lines         19397    19465      +68     
  Branches       4360     4360              
============================================
+ Hits          15760    15833      +73     
+ Misses         2812     2806       -6     
- Partials        825      826       +1     

Impacted Files	Coverage Δ
ballerina/http_status_code_types.bal	100.00% <100.00%> (ø)
...impl/listener/states/http2/EntityBodyReceived.java	55.55% <0.00%> (-5.56%)	⬇️
...timpl/listener/states/http2/SendingEntityBody.java	55.00% <0.00%> (-3.00%)	⬇️
.../contractimpl/sender/http2/Http2TargetHandler.java	70.76% <0.00%> (-1.54%)	⬇️
...nsport/contractimpl/DefaultHttpResponseFuture.java	75.92% <0.00%> (+0.61%)	⬆️
...nsport/contractimpl/Http2OutboundRespListener.java	78.80% <0.00%> (+1.32%)	⬆️
...ransport/message/DefaultFullHttpMessageFuture.java	96.00% <0.00%> (+4.00%)	⬆️
...sport/message/ServerRemoteFlowControlListener.java	75.00% <0.00%> (+12.50%)	⬆️
...ansport/message/DefaultBackPressureObservable.java	92.85% <0.00%> (+14.28%)	⬆️
...transport/message/DefaultBackPressureListener.java	60.00% <0.00%> (+20.00%)	⬆️

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