feat: use a symbol to store patched listeners

[Flarna]

Which problem is this PR solving?

There might be several instances of AsyncHooksContextManager present which would result in clashes.

Short description of the changes

Use a symbol instead a string property to avoid clashes in case several independent instances of AsyncHooksContextManager are present.

[codecov]

Codecov Report

Merging #1356 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1356      +/-   ##
==========================================
+ Coverage   94.11%   94.13%   +0.01%     
==========================================
  Files         145      145              
  Lines        4318     4314       -4     
  Branches      880      877       -3     
==========================================
- Hits         4064     4061       -3     
+ Misses        254      253       -1     

Impacted Files	Coverage Δ
...sync-hooks/src/AbstractAsyncHooksContextManager.ts	98.11% <100.00%> (+1.62%)	⬆️

[dyladan]

change seems fine, and preventing these clashes is always a good thing, but what is the use-case for multiple context managers in a single project?

[Flarna]

I don't think that this is a real usecase someone plans but it can just happen.
I have seen production environments with several APMs inside. All of them tend to have a context manager.

Consider a setup like dev team is using OTel and Operations adds an APM. The APM vendor may have a copy of OTel included.

There is also a possibility that someone just uses/forks the context manager from OTel to create something completely new.

In short, bigger nodejs applications sometimes tend to accumulate a lot stuff together...

[mwear]

LGTM