Reorganise I24 ssx parameters

[noemifrisina]

Try to set up some sort of parameter model

Part of #14

[codecov]

Codecov Report

Merging #18 (f86c292) into main (6bcd7ba) will decrease coverage by 0.09%.
The diff coverage is 64.43%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   46.41%   46.32%   -0.09%     
==========================================
  Files          19       22       +3     
  Lines        3223     3391     +168     
==========================================
+ Hits         1496     1571      +75     
- Misses       1727     1820      +93     

Files Changed	Coverage Δ
src/mx_bluesky/I24/serial/write_nexus.py	19.64% <28.57%> (+5.35%)	⬆️
src/mx_bluesky/I24/serial/initialise_parameters.py	36.00% <36.00%> (ø)
...4/serial/fixed_target/i24ssx_Chip_Collect_py3v1.py	37.43% <37.09%> (-0.83%)	⬇️
...4/serial/extruder/i24ssx_Extruder_Collect_py3v2.py	57.63% <70.17%> (-14.84%)	⬇️
...sky/I24/serial/parameters/experiment_parameters.py	94.82% <94.82%> (ø)
src/mx_bluesky/I24/serial/dcid.py	26.85% <100.00%> (-1.24%)	⬇️
src/mx_bluesky/I24/serial/parameters/__init__.py	100.00% <100.00%> (ø)
src/mx_bluesky/I24/serial/parameters/constants.py	100.00% <100.00%> (ø)
...c/mx_bluesky/I24/serial/setup_beamline/__init__.py	100.00% <100.00%> (ø)
...x_bluesky/I24/serial/setup_beamline/pv_abstract.py	100.00% <100.00%> (ø)

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