Faster InvalidPackageDeclaration

[BraisGabin]

We know that visit a KtFile is not free at all. But we don't have any values to see if this is really faster or not.

My next project on detekt is going to be a tool to monitor the detekt performance. Once we have that we could take a look at the Rule implementation because I think that it pushes to overuse the visit pattern everywhere even in cases that is not needed (for example the one of this PR)

I left this PR as draft because I want to know how much faster is InvalidPackageDeclaration with this change.

[detekt-ci]

	Warnings
⚠️	It looks like this PR contains functional changes without a corresponding test.

Generated by 🚫 dangerJS against b1f69a4

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.74%. Comparing base (bf3fc6f) to head (b1f69a4).

Files	Patch %	Lines
...h/detekt/rules/naming/InvalidPackageDeclaration.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7273      +/-   ##
============================================
- Coverage     84.75%   84.74%   -0.01%     
  Complexity     3992     3992              
============================================
  Files           578      578              
  Lines         12027    12027              
  Branches       2485     2485              
============================================
- Hits          10193    10192       -1     
  Misses          606      606              
- Partials       1228     1229       +1     

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