[FEATURE] Switch to use of terraform-plugin-framework and terraform-plugin-framework-validators

[alexott]

HashiCorp now recommends to use terraform-plugin-framework instead of terraform-plugin-sdk. For example, its adoption will allow to use resource-level validations that are sometimes required for handling of complex checks.

[nfx]

@alexott how compatible is it with common.Resource? does it already have support for resource imports? timeouts? resources without an update callback?

[alexott]

Need to investigate more deeply, filed just not to forget about it as sometimes we need whole resource validation