feat: add IsBigInt decorator

[ales-albert-kilbergr]

Description

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

Fixes

fixes #1255

[braaar]

Do you think there are any relevant options for this validator? It's a shame if we think of them at a later point and need to make a breaking change by adding an input parameter