[transformprocessor/TQL] Instrumentation scope attributes are not accessible

[pirgeo]

Describe the bug
When using TQL in the transformprocessor, instrumentation_scope.attributes and instrumentation_scope.attributes[""] are not available, since the respective mapping functions are not implemented in the TQL contexts (https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/pkg/telemetryquerylanguage/contexts)

What did you expect to see?
Using instrumentation_scope.attributes should give access to scope attributes.

What did you see instead?
Collector did not start:

otel-collector_1  | Error: failed to get config: invalid configuration: processor "transform" has invalid configuration: invalid argument at position 0 invalid path expression [{instrumentation_scope <nil>} {attributes <nil>}]
otel-collector_1  | 2022/08/26 15:37:39 collector server run finished with error: failed to get config: invalid configuration: processor "transform" has invalid configuration: invalid argument at position 0 invalid path expression [{instrumentation_scope <nil>} {attributes <nil>}]

What version did you use?
otel/opentelemetry-collector-contrib:0.58.0

What config did you use?
Config:

processors:
  transform:
    metrics:
      queries:
        - keep_keys(instrumentation_scope.attributes, "scope-attribute-1")

Environment
Docker: otel/opentelemetry-collector-contrib:0.58.0