refactor(robot-server): Robot server command responses

[amitlissack]

Overview

Refactor session command models to eliminate dreaded Union problems in requests and responses.

closes #6519

Changelog

• SessionCommandRequest is a generic that accepts the command type, request data, and response data.
• SessionCommandResponse is derived from SessionCommandRequest
• SessionCommandRequest.make_response creates a SessionCommandResponse

Review requests

Is this clear? Do the comments help?

Risk assessment

Low. Unit and tavern tests beat up on this code pretty well.

[codecov]

Codecov Report

Merging #7170 (acbb1aa) into edge (29fac8a) will increase coverage by 8.67%.
The diff coverage is 97.26%.

@@            Coverage Diff             @@
##             edge    #7170      +/-   ##
==========================================
+ Coverage   78.71%   87.38%   +8.67%     
==========================================
  Files         264       99     -165     
  Lines       18953     4551   -14402     
==========================================
- Hits        14918     3977   -10941     
+ Misses       4035      574    -3461     

Impacted Files	Coverage Δ
...service/session/command_execution/base_executor.py	80.00% <ø> (ø)
...ice/session/command_execution/callable_executor.py	53.33% <0.00%> (ø)
...rver/service/session/models/command_definitions.py	97.14% <ø> (ø)
...erver/service/session/command_execution/command.py	100.00% <100.00%> (ø)
...ver/robot_server/service/session/models/command.py	100.00% <100.00%> (ø)
...rver/service/session/session_types/base_session.py	91.83% <100.00%> (ø)
...on/session_types/live_protocol/command_executor.py	95.83% <100.00%> (ø)
...n/session_types/live_protocol/command_interface.py	89.74% <100.00%> (ø)
...session/session_types/live_protocol/state_store.py	100.00% <100.00%> (ø)
...ssion_types/protocol/execution/command_executor.py	89.13% <100.00%> (ø)
... and 165 more

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[sfoster1]

Nice, love generics

[Laura-Danielle]

Very excited for this!