feat!: separate parsing from linting

[neilime]

This feature is a major rework of php-css-lint, it introduces the separation between parsing css and lint css.

1. Tokenizer is in charge of parsing the CSS content and generating tokens
2. Linter is checking the generated tokens.

Performance has been considered, as the irs a massive usage of Generator

Moreover, thanks to this improvements, we can now parse properly:

• at-rule dedicated properties.
• Nested blocks
• Non-complete declaration

[codecov]

Codecov Report

Attention: Patch coverage is 95.49550% with 50 lines in your changes missing coverage. Please review.

Project coverage is 95.89%. Comparing base (dcc2001) to head (2c99f37).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/CssLint/Tokenizer/Tokenizer.php	88.65%	16 Missing ⚠️
src/CssLint/TokenLinter/IndentationTokenLinter.php	86.66%	8 Missing ⚠️
src/CssLint/Token/BlockToken.php	60.00%	6 Missing ⚠️
src/CssLint/TokenLinter/AtRuleTokenLinter.php	94.54%	6 Missing ⚠️
src/CssLint/Linter.php	91.22%	5 Missing ⚠️
src/CssLint/Tokenizer/Parser/PropertyParser.php	92.06%	5 Missing ⚠️
src/CssLint/Token/AbstractToken.php	96.55%	2 Missing ⚠️
src/CssLint/Tokenizer/Parser/SelectorParser.php	97.56%	1 Missing ⚠️
src/CssLint/Tokenizer/Parser/WhitespaceParser.php	97.67%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #123      +/-   ##
============================================
+ Coverage     95.38%   95.89%   +0.51%     
- Complexity      209      417     +208     
============================================
  Files            11       29      +18     
  Lines           520     1292     +772     
============================================
+ Hits            496     1239     +743     
- Misses           24       53      +29     

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