Add isCnpj

[henriqueleite42]

What this PR introduces?

Issue Number: N/A

• Add isCnpj
• Add isMaskedCnpj

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/techmmunity/utils/blob/master/CONTRIBUTING.md
• Tests for the changes have been added / updated
• Docs have been added / updated
• I followed GitFlow pattern to create the branch
• My code produces no warnings or errors

PR Type

What kind of change does this PR introduce?

[ ] Hotfix
[ ] Bugfix
[x] Feature
[ ] Documentation update
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] CI/CD related changes
[ ] Other: ...

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information (Prints, details, etc)

[github-actions]

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