Lowercase node_name in comparison to match even if it is uppercase

[syou6162]

resolves #73

Description

Fixed a bug that prevented ER diagrams from being output when data source table names were capitalized. This is because the rule part is lower(), but lower is not applied in the is_satisfied_by_exact function. Therefore, the result of the is_selected_table function was determined to be false, and the ER diagram was not output as expected.

• https://github.com/datnguye/dbterd/blob/main/dbterd/adapters/filter.py#L77

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2ae1867) 85.60% compared to head (b4447a2) 85.60%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   85.60%   85.60%           
=======================================
  Files          31       31           
  Lines         910      910           
=======================================
  Hits          779      779           
  Misses        131      131           

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