Make all fields under log.origin.* be consistently nested

[felixbarny]

e.g. "log":{"origin":{"file":{"name": "Foo.java"}}} instead of"log.origin":{"file.name": "Foo.java"}

Extend validator to check top_level_field and lookup both nested and dotted fields.

Note: log.level and log.logger remain to be dotted fields.

[apmmachine]

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• Build Cause: Pull request #120 opened

• • Start Time: 2021-01-20T15:00:14.203+0000

• Duration: 7 min 52 sec

• Commit: bcb1635

Test stats 🧪

Test	Results
Failed	0
Passed	144
Skipped	4
Total	148