fix(rpc): recreate dead and uncleaned subscriptions

[00nktk]

Problem

Currently SubscriptionTracker panics if there's a Weak pointer to a dead Arc<SubscriptionTokenInner>. This happens due to a race condition between SubscriptionTracker::subscribe method and SubscriptionTokenInner Drop implementation since both are trying to acquire a write lock to the same DashMap shard (via DashMap::entry method).

Summary of Changes

• SubscriptionTracker now will recreate the SubscriptionToken with the same id if dead Weak is encountered.
• SubscriptionTokenInner Drop implementation now checks that the Weak pointer is dead before removing it.

Fixes #21948
Closes #22254

[codecov]

Codecov Report

Merging #22281 (567d612) into master (2486e21) will increase coverage by 0.0%.
The diff coverage is 68.1%.

@@           Coverage Diff           @@
##           master   #22281   +/-   ##
=======================================
  Coverage    81.1%    81.1%           
=======================================
  Files         523      523           
  Lines      146705   146714    +9     
=======================================
+ Hits       119012   119028   +16     
+ Misses      27693    27686    -7     

[CriesofCarrots]

Thank you