Terraform-compliance

* Added filtering capability that will help to filter any resource type by a specific property. ([122](https://github.com/eerkunt/terraform-compliance/issues/122))

* Fixed a problem where searched key exists with a different purpose in the root and some of the child elements. E.g. `tags` in aws_s3_bucket and `tags` in `lifecycle_rules` within that bucket.

* Fixed a problem where test are passing directly if one of the drilled down values is a list. ([121](https://github.com/eerkunt/terraform-compliance/issues/121))
* Improved `I expect the result is {operator} than {number}/Its value must be {operator} than {number}` step where the values can also be read and compared mathematically. ([120](https://github.com/eerkunt/terraform-compliance/issues/120))

* Fixed a problem where terraform values including []/None/False was failing due to being negative.

* Fixed a problem where some of the data resources defined in configuration section was not distinguished.

* Fixed a problem where 'its value must not be null' was not working properly