Refactored LogRecords to be mutable so that attributes can be modified after creation

[evanlauer1]

Big Context

Logging Support is being added to hs-opentelemetry. Logging spec

Small (This PR) Context

LogRecords should be modifiable after creation for the purposes of LogRecordProcessors. This PR refactors LogRecord to contain a mutable IORef to an ImmutableLogRecord. It also adds convenience functions for adding attributes to LogRecords and a test suite that tests LoggerProviders and LogRecords.

LogRecords can only be read through the functions of ReadableLogRecord and modified by the functions of ReadWriteLogRecord. This is in accordance with the spec.

The type of the body field was changed from a type variable to an AnyValue so that processors and exporters can process logs from various sources that might have different body types.

Testing

• stack build runs
• New test suite under stack test hs-opentelemetry passes

[evanlauer1]

• #136
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• #131 👈
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• main

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