chore: improve exception for type validation

[tserg]

What I did

Change the exception for validate_expected_type from InvalidType to TypeMismatch.

How I did it

How to verify it

Commit message

chore: change exception type for type validation

This PR changes the exception raised for `validate_expected_type`
from `InvalidType` to `TypeMismatch`.

Description for the changelog

Change exception type for for type validation.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e20885e) 84.78% compared to head (6808495) 84.78%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3759   +/-   ##
=======================================
  Coverage   84.78%   84.78%           
=======================================
  Files          92       92           
  Lines       13122    13129    +7     
  Branches     2933     2934    +1     
=======================================
+ Hits        11125    11132    +7     
  Misses       1534     1534           
  Partials      463      463           

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[charles-cooper]

lgtm - thanks!