Input key checks are unnecessarily case-sensitive

[Vendicated]

Describe the bug There are a lot of contexts whose possible input keys are case insensitive. For example, both secrets.BANANA and secrets.banana work just fine (from the github secrets docs: "Names are not case-sensitive."). This applies to secrets, with blocks, and many more. The extension currently erroneously reports an error when not using the same casing as the definition

To Reproduce Steps to reproduce the behavior:

1. Create repo secret called "BANANA"
2. Use secret via secrets.banana

Expected behavior No error is reported

Screenshots

Extension Version v0.25.4

Additional context