fix: ignore enum constant arguments for no-magic-number

[nxtSwitch]

What is the purpose of this pull request? (put an "X" next to an item)

• Documentation update
• Bug fix
• New rule
• Changes an existing rule
• Add autofixing to a rule
• Add a CLI option
• Add something to the core
• Other, please explain:

What changes did you make? (Give an overview)

Ignoring numbers in enum

Example

enum ExitCode {
  /// The successful exit.
  success(0),

  /// The command was used incorrectly.
  usage(64),

  /// An internal software error has been detected.
  software(70),

  /// Something was found in an unconfigured or misconfigured state.
  config(78);

  final int code;

  const ExitCode(this.code);
}

[incendial]

@nxtSwitch thank you for the fix! Could you please update the changelog?

[codecov]

Codecov Report

Merging #1150 (bcf88cd) into master (91cfb6a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head bcf88cd differs from pull request most recent head 24a5375. Consider uploading reports for the commit 24a5375 to get more accurate results

@@           Coverage Diff           @@
##           master    #1150   +/-   ##
=======================================
  Coverage   85.53%   85.53%           
=======================================
  Files         350      350           
  Lines        7893     7897    +4     
=======================================
+ Hits         6751     6755    +4     
  Misses       1142     1142           

Impacted Files	Coverage Δ
...les_list/no_magic_number/no_magic_number_rule.dart	93.47% <100.00%> (+0.62%)	⬆️

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[incendial]

@nxtSwitch thank you for the contribution!