Draft: Improve performance of is_function

[eendebakpt]

For instruments with many parameters (100 - 1000 range) the overhead of qcodes parameters becomes a bottleneck in startup time. In this PR we improve performance of is_function:

main: 6.65 μs ± 185 ns per loop (mean ± std. dev. of 7 runs, 100,000 loops each)
PR: 668 ns ± 31.3 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)

Testing code:

def f(x):
    return None
arg_count=1
%timeit is_function0(f, arg_count) 

(there are more bottlenecks, but is_fuction is used in creation of every Parameter and is quite heavy)

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[jenshnielsen]

Thanks @eendebakpt That seems very useful. In the long term I think we should consider completely removing and simplifying the command class from parameter but until then this seems like a nice improvement. I did not look into why the tests doesn't like this as is

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.77%. Comparing base (c2ab4c3) to head (674bfaa).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
src/qcodes/utils/function_helpers.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7669      +/-   ##
==========================================
- Coverage   59.78%   59.77%   -0.02%     
==========================================
  Files         352      352              
  Lines       31659    31671      +12     
==========================================
+ Hits        18927    18931       +4     
- Misses      12732    12740       +8     

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