refactor: Subscription Manager uses async framework

[cindyyan317]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 16 lines in your changes missing coverage. Please review.

Project coverage is 69.85%. Comparing base (49e9d5e) to head (4211a04).
Report is 5 commits behind head on develop.

Files	Patch %	Lines
src/feed/SubscriptionManager.hpp	31.25%	4 Missing and 7 partials ⚠️
src/feed/impl/BookChangesFeed.hpp	0.00%	0 Missing and 1 partial ⚠️
src/feed/impl/LedgerFeed.hpp	0.00%	0 Missing and 1 partial ⚠️
src/feed/impl/ProposedTransactionFeed.cpp	85.71%	1 Missing ⚠️
src/feed/impl/ProposedTransactionFeed.hpp	50.00%	0 Missing and 1 partial ⚠️
src/feed/impl/TransactionFeed.cpp	93.75%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1605      +/-   ##
===========================================
+ Coverage    69.61%   69.85%   +0.24%     
===========================================
  Files          257      260       +3     
  Lines         9879     9917      +38     
  Branches      5457     5466       +9     
===========================================
+ Hits          6877     6928      +51     
- Misses        1588     1589       +1     
+ Partials      1414     1400      -14     

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[kuznetsss]

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