Resolve conflict in decoder_hcl.go by keeping typed object keys via
convertCtyValueToNode (preserves int/bool/float keys in YAML) rather than
coercing all keys to strings. Retain PR test case for integer key with
empty object value, adapted to typed key output.
Co-authored-by: Cursor <cursoragent@cursor.com>
HCL object keys may be non-string literals (e.g. a number like 1). The
decoder called cty.Value.AsString on the evaluated key, which panics with
'not a string' for any non-string key type. Mirror OpenTofu/Terragrunt by
silently converting non-string keys to their string representation via
cty/convert. Add decode scenarios covering numeric and boolean keys.
