[DoNotMerge] ReadableLogRecord is able to access the passed context

[pellared]

Related to #3907

Changes

Clarify that ReadableLogRecord is able to access all information added via "Emit a log record".

This is needed so that the SDK is able to get access to the passed Context (https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/bridge-api.md#emit-a-logrecord) which can contain e.g. some baggage that may want to be used e.g. by custom processors.

I think that the original intention of the spec authors was "Emit a Record" as "LogRecord" data model already defined fields that are later defined in ReadableLogRecord (e.g. Instrumentation Scope, Resource).

[tigrannajaryan]

I agree, this was the initial intent and I consider this to be a spec bug, so fixing it is not a breaking change.

[pellared]

@jack-berg pointed out that processor has access to the Context via a separate argument: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/sdk.md#onemit

I think that my PR would do more harm than benefits.

I am considering closing this PR.