feat(schema): wire proto-generated types into packageLogs.ts

[brucearctor]

Summary

Replace the untyped Logging.Log = JSONObject with proto-generated types (RawLog, IntervalLog, CustomLog) from log_pb.ts in packageLogs.ts.

Breaking Changes

This changes the default JSON output format:

• Fields restructured to match proto schema (nested metadata object)
• Field renames: type → eventType, scrnRes → screenResolution
• buildAttrs() stops JSON.parse()-ing attribute values (always strings)
• logType values may change (raw → LOG_TYPE_RAW)

Migration Path

• HttpLegacyJsonExporter preserves v2.x JSON format
• Users can opt into legacy format via exporterType: 'http-json-legacy'

Depends On

• Feature(schema): Enforce log structure #105 (proto schema — merged)
• feat(export): introduce LogExporter interface #139 (LogExporter interface)

Related

• Resolves the TODO on line 77 of types.d.ts: // TODO: Switch to protobuf for managing log types