feat(): add bigint to built-in types

[esahin90]

See: https://mongoosejs.com/docs/schematypes.html#bigint

PR Checklist

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• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

BigInt is not supported as a primitive type

What is the new behavior?

BigInt is supported by mongoose and will be supported here as well with these changes

Does this PR introduce a breaking change?

• Yes
• No

Other information

[esahin90]

Hey @kamilmysliwiec
Would appreciate it, if you have some time for a little review for a pretty small code change :)
Best regards,
Emre

[nhayhoc]

I hope it gets updated soon

[esahin90]

@nhayhoc I‘m using patch-package to patch the node_modules locally and make it work for now as a workaround.

[kamilmysliwiec]

LGTM