Improves deserialization efficiency for agents.

[horned-sphere]

Agent implementations can now keep persistent deserializers for their lanes rather than recreating them each time.

The agents created by the derive macro have been updated to make use of this.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 145 lines in your changes missing coverage. Please review.

Project coverage is 49.23%. Comparing base (c3e09d6) to head (3217459).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
server/swimos_agent/src/lanes/map/mod.rs	27.55%	71 Missing ⚠️
...r/swimos_agent_derive/src/lane_model_derive/mod.rs	0.00%	57 Missing ⚠️
swimos/tests/deriveagentlanemodel.rs	38.46%	8 Missing ⚠️
server/swimos_agent/src/lib.rs	66.66%	3 Missing ⚠️
server/swimos_agent/src/agent_model/mod.rs	60.00%	2 Missing ⚠️
server/swimos_agent/src/event_handler/mod.rs	75.00%	2 Missing ⚠️
server/swimos_connector/src/generic/mod.rs	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #741      +/-   ##
==========================================
- Coverage   49.37%   49.23%   -0.15%     
==========================================
  Files         401      402       +1     
  Lines       35004    35124     +120     
==========================================
+ Hits        17284    17294      +10     
- Misses      17720    17830     +110     

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