mod_http_oauth2: Declare additional client registration fields as strings Previously any property not listed in the schema was allowed in any form, which is probably a bit too liberal. Instead, limit extra fields to simple strings, which should still allow localized versions of the various URIs and descriptive properties per RFC 7591 §2.2

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summary: Extra verbose logging of sent and received
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Summary
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Sometimes it is useful to get the raw XML logs from clients for
debugging purposes, but some clients don't expose this.

This module logs dumps everything sent and received into debug logs, for
debugging purposes.