serve api should accept str for model argument

[madhur-tandon]

Closes #412

[codecov]

Codecov Report

Base: 89.39% // Head: 89.48% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (5ec5122) compared to base (51f328a).
Patch coverage: 95.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #425      +/-   ##
==========================================
+ Coverage   89.39%   89.48%   +0.08%     
==========================================
  Files          81       81              
  Lines        6376     6388      +12     
==========================================
+ Hits         5700     5716      +16     
+ Misses        676      672       -4     

Impacted Files	Coverage Δ
mlem/cli/main.py	68.58% <75.00%> (+3.09%)	⬆️
mlem/api/commands.py	88.88% <100.00%> (ø)
mlem/contrib/pandas.py	93.10% <100.00%> (ø)
mlem/ui.py	93.24% <100.00%> (+0.48%)	⬆️
mlem/utils/module.py	89.25% <100.00%> (-0.86%)	⬇️

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[mike0sv]

It's already fixed in #413

[madhur-tandon]

It's already fixed in #413

Do you wanna merge it together with that or separately with this?