Create a Forward map wrapper to more easily test pipelines without using an emulator

[odunbar]

Co-authored by @ArneBouillon

Purpose

Closes #401
See updated docs here

Content

• Created ForwardMapWrapper with constructor

no_emulator = forward_map_wrapper(
   G, # a function
    prior,
    input_output_pairs;
    encoder_schedule = encoder_schedule,
    encoder_kwargs = encoder_kwargs,
)

• Created the get_ and predict methods
• Validated this produces results in the sinusoid example
• Unit tests

MISC

• Move machine learning tools into subdirectory
• Bugfix a ; error for mlt_kwargs in predict(emulator,...)

Results from Sinusoid/

The key here is that "FM" is using the true forward map exactly replacing the emulator

---

• I have read and checked the items on the review checklist.

[odunbar]

Test fail from unrelated issue, waiting on merge of #403

[ArneBouillon]

After our meeting: I think this is useful as-is, but maybe we should add a warning if someone tries to pass in an input space encoder schedule, since they are currently unused.

[odunbar]

I've added a warning on creation of the FMW

┌ Warning: Please note that only the output encoder is used in this implementation. 
│ The input encoder will be initialized if provided, but not used during sampling, which is completed in the full parameter space.
└ @ CalibrateEmulateSample.Emulators 

[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.25%. Comparing base (c011a05) to head (b79be2c).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Emulator.jl	96.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   94.20%   94.25%   +0.04%     
==========================================
  Files          10       10              
  Lines        1813     1862      +49     
==========================================
+ Hits         1708     1755      +47     
- Misses        105      107       +2     

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