Migrate subscriptions engine to graphql-yoga

[MichalLytek]

• use @graphql-yoga instead of graphql-subscriptions as the subscriptions engine
• require providing PubSub implementation into buildSchema option when using @Subscription
• remove @PubSub in favor of directly importing created PubSub implementation
• remove Publisher and PubSubEngine types
• add support for dynamic topic id function in @Subscription decorator option

[carlocorradini]

@MichalLytek Awesome.

What is missing?

[MichalLytek]

@carlocorradini Fixing pipeline issues, upgrading redis subscriptions example.

[carlocorradini]

Can I help somehow? ☺️

[carlocorradini]

@MichalLytek See PR #1590 🤗🥳

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0ad04ab) 95.52% compared to head (f5aa0d0) 95.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1578      +/-   ##
==========================================
- Coverage   95.52%   95.50%   -0.02%     
==========================================
  Files         113      113              
  Lines        1854     1848       -6     
  Branches      367      364       -3     
==========================================
- Hits         1771     1765       -6     
  Misses         83       83              

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