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feat: Fix decryption of strings larger than 4 MiB  (#411)

* fix: fix decrypting strings larger than 4 MiB

The `cloakedStringRegex` fails to parse ciphertexts larger than about
4 MiB. This is due to [limitations in V8's regex engine][1].

I've adapted the implementation from
https://github.com/validatorjs/validator.js/pull/503 under the MIT
license, as it solves the error.

[1]: https://issues.chromium.org/issues/42207207

* feat: export `parseCloakedString` function

This function can be used instead of `cloakedStringRegex` on large
strings.

* feat: deprecate `cloakedStringRegex`

This regex fails on large 4 MiB + strings.
`parseCloakedString` should be used instead when possible.

* test: test decrypting strings larger than 4 MiB

This fails in Node.JS v20.17.0 with @47ng/cloak v1.1.0.

* chore: Make hex & base64 Regexes case-insensitive

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Co-authored-by: François Best <github@francoisbest.com>

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