Make full_name a cached_property

[jenshnielsen]

In examples without instrument communication / significant data storage full_name contributes significantly to runtime of measurements.

TODO

• [ ] Profile that this matters for real examples
• [ ] Does this have any negative consequences. i.e. for dynamic parameters. Do we support dynamically changing parent.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 59.76%. Comparing base (92858ca) to head (0b9354d).

Files with missing lines	Patch %	Lines
src/qcodes/instrument/channel.py	0.00%	2 Missing :warning:
src/qcodes/instrument/instrument_base.py	0.00%	2 Missing :warning:
src/qcodes/metadatable/metadatable_base.py	0.00%	2 Missing :warning:
src/qcodes/parameters/function.py	0.00%	2 Missing :warning:
src/qcodes/parameters/parameter_base.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7706      +/-   ##
==========================================
- Coverage   59.77%   59.76%   -0.01%     
==========================================
  Files         352      352              
  Lines       31688    31692       +4     
==========================================
  Hits        18942    18942              
- Misses      12746    12750       +4     

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