[ISSUE #4087] Anonymous new can be replaced with lambda.[AsyncSubClient]

[kartiktayal]

Fixes #4087

Please refer #4087 for details. Code optimisation done.

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[harshithasudhakar]

LGTM

[codecov]

Codecov Report

Merging #4391 (292ab21) into master (3d4e922) will not change coverage.
The diff coverage is n/a.

❗ Current head 292ab21 differs from pull request most recent head 51fd5aa. Consider uploading reports for the commit 51fd5aa to get more accurate results

@@            Coverage Diff            @@
##             master    #4391   +/-   ##
=========================================
  Coverage     17.85%   17.85%           
  Complexity     1514     1514           
=========================================
  Files           602      602           
  Lines         25518    25518           
  Branches       2400     2400           
=========================================
  Hits           4555     4555           
  Misses        20524    20524           
  Partials        439      439           

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[mxsm]

LGTM