fix(common): introduce magic file type validator to nestjs common

[Chathula]

• introduce magic file type validator logic to nestjs common with validator class FileTypeValidator

PR Checklist

Please check if your PR fulfills the following requirements:

• 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:

• security enhancement fix

What is the current behavior?

Issue Number: N/A

What is the new behavior?

• now user can use addMagicFileTypeValidator pipe method instead of addFileTypeValidator pipe to more secure mime type validation

Does this PR introduce a breaking change?

• Yes
• No

Other information