Don't check macros in check-model hooks

[PabloPardoGarcia]

This PR attempts to fix #14 and fix #17 , it prevents macro SQL files from being selected by the hooks check-model.

My idea with this changes is to remove the checks on macros in the hooks check-model- and ideally create specific hooks for macros, such as check-macro-has-description. I can create PR with the macro hooks @tomsej

[codecov-io]

Codecov Report

Merging #18 (15569af) into main (607cb07) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #18   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         1597      1607   +10     
  Branches       210       212    +2     
=========================================
+ Hits          1597      1607   +10     

Impacted Files	Coverage Δ
pre_commit_dbt/check_model_columns_have_desc.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_all_columns.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_description.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_meta_keys.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_properties_file.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_tests.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_tests_by_group.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_tests_by_name.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_has_tests_by_type.py	100.00% <100.00%> (ø)
pre_commit_dbt/check_model_parents_and_childs.py	100.00% <100.00%> (ø)
... and 2 more

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[tomsej]

Great work @PabloPardoGarcia thanks a lot for the contribution! I really appreciate it 🎉