Fix maskInlineIgnore to handle non-ascii input

[kian99]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features) see docs/README.md

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Bug-fix

What is the current behavior? (You can also link to an open issue here)
#278 - Crash when running against non-ascii input.

What is the new behavior (if this is a feature change)?
No crash on non-ascii input.

Does this PR introduce a breaking change? (What changes might users need to make due to this PR?)
No

Other information:
The maskInlineIgnore would be converted to a slice of runes, but the length of a slice of runes is not equal to the length of a string when non-ascii characters are present. In the rune representation, each index element is a 32-bit code-point while len(string) returns the number of bytes in the string. A good reference is https://go.dev/blog/strings

I've opted to use the already existing ignoreRuleRegex to replace the characters that were previously being replaced with null terminators. I've also added some tests for this.

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