Logs SDK: consider renaming `*LogExporter` to `*LogRecordExporter` and similar for consistency

[lmolkova]

Spec defines LogRecordExporter (LogRecordProcessor, LogRecordLimits)

In python it's used inconsistently: LogRecordProcessor, but LogExporter.

Consider following renames:

• LogExporter -> LogRecordExporter (ConsoleLogExporter -> ConsoleLogRecordExporter, OTLP, etc)
• LogLimits -> LogRecordLimits
• LogExportResult -> LogRecordExportResult
• ...

Part of open-telemetry/community#1751