Add completion and hover support for built-in / reserved blocks/attributes

[paultyng]

This TF version specific potentially (ie. for_each).

Providers:

• alias
• version (is this 0.12 only? not sure if it still exists in 0.13)

Resources:

• depends_on
• count
• for_each
• provider
• lifecycle
  • create_before_destroy
  • prevent_destroy
  • ignore_changes
• provisioner
• connection

Data Sources:

• depends_on
• count
• for_each
• provider

Additional top level blocks:

• terraform
• variable Add completion support for variable blocks #122
• output Add completion support for output blocks. #123
• backend

[radeksimko]

I'm happy to track this as a tickable list, just FYI that all of the above depends on #36 - i.e. having a proper parser for blocks which don't have an explicitly "parseable" schema.

[ghost]

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