feat!: Replace context.tf with context provider and align with snowflake provider changes

[dgniewek]

This PR introduces a BREAKING CHANGE

List of code and variable (API) changes:

• Removed context.tf file (a single-file module with additional variables), which implied a removal of all its variables (except name):
  • descriptor_formats
  • label_value_case
  • label_key_case
  • id_length_limit
  • regex_replace_chars
  • label_order
  • additional_tag_map
  • tags
  • labels_as_tags
  • attributes
  • delimiter
  • stage
  • environment
  • tenant
  • namespace
  • enabled
  • context
• Remove support enabled flag - that might cause some backward compatibility issues with terraform state (please take into account that proper move clauses were added to minimize the impact), but proceed with caution
• Additional context provider configuration
• New variables were added, to allow naming configuration via context provider:
  • context_templates
  • name_scheme
  • drop_public_schema_on_creation which is true by default

[github-actions]

The new version v3.0.0 has been released 🎉