[Discover][OTel] Add accordion sections for Attributes tab

[kpatticha]

Summary

In OpenTelemetry, metadata are represented as Attributes. Elastic stores these attributes in document fields in these namespaces:

• attributes.*: Span, LogRecord, Metric point, or Profile attributes, depending on the signal
• resource.attributes.*: Resource attributes
• scope.attributes.*: Instrumentation scope attributes

Some indexes for non-OpenTelemetry data have mappings for these attribute namespaces as well, so it's possible that any signal in Discover might have attribute fields.

Designs

Acceptance criteria

• Display 3 sections
  - {Signal} attributes (where Signal is Log, Span, etc.)
  - Resource attributes
  - Instrumentation scope attributes
• The sections should have title, tooltip and a count (tooltip: TBD)
• Accordion sections should be open by default
• In each section should be a data table with 2 columns
  - Attribute
  - Value
• Selected/Available/Empty
• The attribute names should not display the whole namespace (resource.attributes.telemetry.sdk.language), but only the part of the field name belonging to the given attribute namespace: telemetry.sdk.language.
• filtering controls should use the entire field name (T
• Don't use pagination for the table
• Reuse components from discover (filter controls, data table etc)