feature: add nullable option for IsNotEmptyObject decorator

[NoNameProvided]

Description

This issue us copied and modified from PR #635 by @ytetsuro,

Currently, the @IsNotEmptyObject decorator allows objects with null values only. I would like an option for the @IsNotEmptyObject decorator to fail validation when all object property is null or undefined.

Proposed solution

Minimal example of proposed feature:

class MyClass {
  @IsNotEmptyObject()
  notStrictModeInvalid = { }; // invalid

  @IsNotEmptyObject()
  notStrictModeValid = { key1: null, key2: undefined }; // valid

  @IsNotEmptyObject({ nullable: false })
  strcitModeInvalid = { }; // invalid

  @IsNotEmptyObject({ nullable: false })
  strcitModeValid = { key1: null, key2: undefined }; // invalid

  @IsNotEmptyObject({ nullable: false })
  strcitModeValid = { key1: 'key', key2: undefined }; // valid
}

[NoNameProvided]

This has been fixed in develop and be included in the next release.

[github-actions]

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