Optimize code to replace the df

[Kaniyaki]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 92.99%. Comparing base (5574283) to head (20562e2).

Files	Patch %	Lines
src/estimagic/parameters/check_constraints.py	82.60%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #452      +/-   ##
==========================================
+ Coverage   92.98%   92.99%   +0.01%     
==========================================
  Files         194      195       +1     
  Lines       14659    14680      +21     
==========================================
+ Hits        13631    13652      +21     
  Misses       1028     1028              

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[Kaniyaki]

Optimized the "check_fixes_and_bounds" function, which originally had a runtime of 5.61 ms.
The main problem was that it used DataFrame.
Instead of it, I used a dictionary and added the "_iloc" function as a substitute for DataFrame.iloc. Current runtime is 55 µs, which is a significant improvement.
In the end, I made sure that all tests passed, and they did.
Below, you can see the comparison for the runtime using %timeit and %lprun.
lprun_comparison.pdf
timeit_comparison.pdf