Simplify dataclasses and add more tests

[jessicamillar]

• Remove immutability constraints on dataclasses
• Test the schema that can create dataclass instances

[codecov[bot]]

Codecov Report

Merging #82 (c70ef65) into main (fcb1a0a) will increase coverage by 7.91%. The diff coverage is 98.05%.

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   84.32%   92.24%   +7.91%     
==========================================
  Files         166      167       +1     
  Lines        6061     6536     +475     
==========================================
+ Hits         5111     6029     +918     
+ Misses        950      507     -443     

Impacted Files	Coverage Δ
...paceheat/data_classes/component_attribute_class.py	100.00% <ø> (ø)
.../gt/gt_electric_meter_cac/gt_electric_meter_cac.py	100.00% <ø> (+11.11%)	:arrow_up:
...schema/gt/gt_temp_sensor_cac/gt_temp_sensor_cac.py	100.00% <ø> (+11.11%)	:arrow_up:
...a/gt/gt_temp_sensor_cac/gt_temp_sensor_cac_base.py	100.00% <ø> (+41.07%)	:arrow_up:
...ta_classes/components/electric_heater_component.py	83.33% <83.33%> (-2.39%)	:arrow_down:
...eter_component/gt_electric_meter_component_base.py	97.29% <85.71%> (+35.13%)	:arrow_up:
...or_component/gt_pipe_flow_sensor_component_base.py	97.29% <85.71%> (+37.83%)	:arrow_up:
..._sensor_component/gt_temp_sensor_component_base.py	97.29% <85.71%> (+35.13%)	:arrow_up:
...or_component/gt_boolean_actuator_component_base.py	97.67% <87.50%> (+39.53%)	:arrow_up:
...ter_component/gt_electric_heater_component_base.py	97.29% <87.50%> (+37.83%)	:arrow_up:
... and 75 more

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