Improvies debugability of event handlers.

[horned-sphere]

Adds a describe method to the HandlerAction trait that will provideda debug formatted description of the handler using information from the agent context.

[codecov]

Codecov Report

Attention: Patch coverage is 2.16777% with 1038 lines in your changes missing coverage. Please review.

Project coverage is 49.37%. Comparing base (f7018ce) to head (2410096).
Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
server/swimos_agent/src/event_handler/mod.rs	2.57%	189 Missing ⚠️
server/swimos_agent/src/lanes/map/mod.rs	0.00%	158 Missing ⚠️
server/swimos_agent/src/lanes/join/map/mod.rs	3.94%	73 Missing ⚠️
server/swimos_agent/src/lanes/join/value/mod.rs	3.94%	73 Missing ⚠️
server/swimos_agent/src/stores/map/mod.rs	0.00%	60 Missing ⚠️
server/swimos_agent/src/lanes/value/mod.rs	1.69%	58 Missing ⚠️
...erver/swimos_agent/src/lanes/http/lifecycle/mod.rs	0.00%	49 Missing ⚠️
server/swimos_agent/src/lanes/demand_map/mod.rs	0.00%	44 Missing ⚠️
...erver/swimos_agent/src/agent_model/downlink/mod.rs	0.00%	43 Missing ⚠️
...er/swimos_agent/src/lanes/join/map/downlink/mod.rs	0.00%	38 Missing ⚠️
... and 17 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #735      +/-   ##
==========================================
- Coverage   50.80%   49.37%   -1.44%     
==========================================
  Files         401      401              
  Lines       33783    34769     +986     
==========================================
+ Hits        17165    17166       +1     
- Misses      16618    17603     +985     

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