Do not kill kuksa.val.v1 GRPC connection due to slow subscriber

[SebastianSchildt]

Since the v2 API rework, KUKSA is warning you when a subscriber can not keep up processing all messages due to limited buffers of general overload. In case of v2 the message is just dropped, in v1 the GRPC connection has been severed as well as the tokio thread serving it panicked.

This has been fixed now, and the behavior of v1 mimicks that of v2: You still get a warning in KUKSA, but the connection remains stable and the app can continue.

The only "real" change is in the first commit:
f6ffb37

The rest is due to updated clippy rules.

[codecov]

Codecov Report

Attention: Patch coverage is 23.45679% with 62 lines in your changes missing coverage. Please review.

Project coverage is 62.07%. Comparing base (9819bf9) to head (35ae2bc).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
databroker/src/broker.rs	34.61%	17 Missing ⚠️
databroker/src/types.rs	6.25%	15 Missing ⚠️
databroker/src/grpc/kuksa_val_v2/val.rs	42.10%	11 Missing ⚠️
databroker/src/grpc/kuksa_val_v2/conversions.rs	12.50%	7 Missing ⚠️
databroker/src/grpc/kuksa_val_v1/val.rs	0.00%	5 Missing ⚠️
databroker-cli/src/main.rs	0.00%	2 Missing ⚠️
databroker-cli/src/kuksa_cli.rs	0.00%	1 Missing ⚠️
databroker/src/authorization/jwt/decoder.rs	0.00%	1 Missing ⚠️
databroker/src/viss/v2/server.rs	0.00%	1 Missing ⚠️
databroker/src/vss.rs	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   62.60%   62.07%   -0.53%     
==========================================
  Files          37       37              
  Lines       18416    17095    -1321     
==========================================
- Hits        11529    10612     -917     
+ Misses       6887     6483     -404     

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[lukasmittag]

LGTM