Mark filter stale for Besu nodes

[nguyer]

Not all Ethereum nodes return exactly the same error message when a filter does not exist. This caused ETHConnect to not be able to recreate a filter automatically in some cases, for example if a Besu node was restarted. This would result in log messages like:

[2023-10-19T06:50:07.739Z] ERROR es-1fb7a291-487f-404b-44ab-0a36a0da4dae: subscription error: Filter not found

This PR fixes this issue to make ETHConnect a bit more flexible to be able to recreate the filter automatically in this case.

[codecov-commenter]

Codecov Report

Merging #238 (828d35a) into main (111eb89) will decrease coverage by 0.04%.
Report is 4 commits behind head on main.
The diff coverage is n/a.

❗ Current head 828d35a differs from pull request most recent head 64c391b. Consider uploading reports for the commit 64c391b to get more accurate results

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
- Coverage   97.26%   97.22%   -0.04%     
==========================================
  Files          59       59              
  Lines        7521     7524       +3     
==========================================
  Hits         7315     7315              
- Misses        163      165       +2     
- Partials       43       44       +1     

see 2 files with indirect coverage changes