add low level 2d profile plot function and 2d profile function

[EchoRLiu]

This PR is to address #1651.

To do so, I added two new visualization functions:

1. profile_lowlevel_2d() - Visualizes the relationship between two parameters during profiling

• Shows one profiled parameter on the x-axis and tracks a second parameter on the y-axis
• Uses color mapping (via scatter plot) to indicate objective ratio or function values along the profile path

2. visualize_2d_profile() - High-level n by n profile grid:

• Diagonal plots: Shows traditional 1D profiles for each parameter
• Off-diagonal plots: Shows 2D parameter relationships during profiling using profile_lowlevel_2d()

This would provide a complete overview of how parameters interact during profile likelihood computation

TODO List for still needed improvements:

• there is some weird jumps when doing profile
• some range can not be profiled
• color scheme can be improved
• original profile function can also be improved with threshold

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Codecov Report

❌ Patch coverage is 3.00000% with 97 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.72%. Comparing base (a559537) to head (c3612e7).

Files with missing lines	Patch %	Lines
pypesto/visualize/profiles.py	2.02%	97 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1652      +/-   ##
===========================================
- Coverage    84.28%   83.72%   -0.56%     
===========================================
  Files          163      163              
  Lines        14136    14235      +99     
===========================================
+ Hits         11914    11918       +4     
- Misses        2222     2317      +95     

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