Pick core schema only based on required_version
constraint
#1027
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Depends on hashicorp/terraform-schema#129
Closes #993
UX Impact
While the primary motivation behind the change was performance, it brings a minor UX impact.
IntelliSense with too old version (e.g. 0.10)
Before: No IntelliSense available, most schema-dependent jobs providing data for IntelliSense fail, as per errors in log.
After: 0.12-based IntelliSense provided, no errors in log.
The UX for too new version (e.g. 1.5.0) and for when the version is not known (yet) remains practically the same, it is just hopefully more obvious from the changed code combined with the upstream tfschema changes.