Add log2 transformation for parameters and observable

[sebapersson]

Closes #260

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.07%. Comparing base (ca3ee0e) to head (16159c5).

Files with missing lines	Patch %	Lines
src/derivatives/common.jl	50.00%	2 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
- Coverage   91.08%   91.07%   -0.01%     
==========================================
  Files          61       61              
  Lines        3937     3945       +8     
==========================================
+ Hits         3586     3593       +7     
- Misses        351      352       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.