Add support for sharded PubSub

[leibale]

Refactor PubSub
fix #2354 - Add support for sharded PubSub
fix #1968 - PUBSUB SHARDCHANNELS command
fix #2345 ref #2321 - PING in PubSub mode
fix #2302 - error listener note in the main README
fix #2065 - Cluster + PubSub
fix #1973 - SSUBSCRIBE
fix #1975 - SUNSUBSCRIBE
Add minimizeConnections configuration for clusters

renamed branch from #2344

[codecov-commenter]

Codecov Report

Base: 95.85% // Head: 95.83% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (a94d316) compared to base (6642278).
Patch coverage: 83.10% of modified lines in pull request are covered.

❗ Current head a94d316 differs from pull request most recent head 80eddda. Consider uploading reports for the commit 80eddda to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2373      +/-   ##
==========================================
- Coverage   95.85%   95.83%   -0.02%     
==========================================
  Files         451      454       +3     
  Lines        4247     4515     +268     
  Branches      475      511      +36     
==========================================
+ Hits         4071     4327     +256     
- Misses        106      115       +9     
- Partials       70       73       +3     

Impacted Files	Coverage Δ
packages/client/lib/commands/CLUSTER_SLOTS.ts	100.00% <ø> (ø)
...ckages/client/lib/commands/generic-transformers.ts	100.00% <ø> (ø)
packages/client/lib/cluster/index.ts	80.00% <76.92%> (+2.38%)	⬆️
packages/client/lib/cluster/cluster-slots.ts	80.00% <79.80%> (+20.54%)	⬆️
packages/client/lib/client/pub-sub.ts	82.73% <82.73%> (ø)
packages/client/lib/client/commands-queue.ts	88.42% <90.24%> (+5.52%)	⬆️
packages/client/lib/client/socket.ts	82.30% <92.00%> (+4.34%)	⬆️
packages/client/lib/client/index.ts	92.60% <95.23%> (+0.60%)	⬆️
packages/client/lib/client/commands.ts	100.00% <100.00%> (ø)
packages/client/lib/cluster/commands.ts	100.00% <100.00%> (ø)
... and 9 more

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