Added mmotifs and aamp_motifs to top level API

[seanlaw]

Pull Request Checklist

Below is a simple checklist but please do not hesitate to ask for assistance!

• Fork, clone, and checkout the newest version of the code
• Create a new branch
• Make necessary code changes
• Install black (i.e., python -m pip install black or conda install -c conda-forge black)
• Install flake8 (i.e., python -m pip install flake8 or conda install -c conda-forge flake8)
• Install pytest-cov (i.e., python -m pip install pytest-cov or conda install -c conda-forge pytest-cov)
• Run black . in the root stumpy directory
• Run flake8 . in the root stumpy directory
• Run ./setup.sh && ./test.sh in the root stumpy directory
• Reference a Github issue (and create one if one doesn't already exist)

[codecov-commenter]

Codecov Report

Merging #580 (30ff810) into main (4251ac3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #580   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          80       80           
  Lines       11241    11247    +6     
=======================================
+ Hits        11229    11235    +6     
  Misses         12       12           

Impacted Files	Coverage Δ
stumpy/__init__.py	100.00% <100.00%> (ø)
tests/test_aamp_mmotifs.py	100.00% <100.00%> (ø)
tests/test_mmotifs.py	100.00% <100.00%> (ø)
tests/test_non_normalized_decorator.py	100.00% <100.00%> (ø)

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