Serialize log body any value

[jack-berg]

Followup to #5880 which updates OTLP log record marshaling to properly encode AnyValue log bodies.

Leaving as a draft until #5880 is resolved.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...etry/exporter/internal/marshal/JsonSerializer.java	94.28% <ø> (+2.85%)	⬆️
...try/exporter/internal/marshal/ProtoSerializer.java	96.47% <ø> (ø)
...elemetry/exporter/internal/marshal/Serializer.java	79.78% <ø> (ø)
...exporter/internal/otlp/ArrayAnyValueMarshaler.java	100.00% <100.00%> (ø)
.../exporter/internal/otlp/BoolAnyValueMarshaler.java	100.00% <100.00%> (ø)
...exporter/internal/otlp/BytesAnyValueMarshaler.java	100.00% <100.00%> (ø)
...xporter/internal/otlp/DoubleAnyValueMarshaler.java	100.00% <100.00%> (ø)
...r/internal/otlp/InstrumentationScopeMarshaler.java	94.44% <100.00%> (+0.15%)	⬆️
...y/exporter/internal/otlp/IntAnyValueMarshaler.java	100.00% <100.00%> (ø)
...r/internal/otlp/KeyValueListAnyValueMarshaler.java	100.00% <100.00%> (ø)
... and 14 more

📢 Thoughts on this report? Let us know!.

[jack-berg]

Marking this PR as ready for review since #5880 has been merged.

[scheler]

@open-telemetry/java-approvers can you please take a look and review this PR? We want to use these changes and hence interested in getting this PR merged. Thanks.