/config_dump skips the formatters field in SubstitutionFormatString

[rgs1]

We started using formatter extensions (#14512) and I noticed that the config dump endpoint skips the formatters field within the log_format message field [0], e.g.:

              "typed_config": {
               "@type": "type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog",
               "path": "/var/log/access.log",
               "log_format": {
                "text_format_source": {
                 "inline_string": "... stuff ...\n"
                }
               }

I suspect it might be either because:

a) TypedExtensionConfig fields are skipped
b) the actual message we are using within the TypedExtensionConfig message is empty

[0] https://github.com/envoyproxy/envoy/blob/main/api/envoy/config/core/v3/substitution_format_string.proto#L111

[rgs1]

Not sure if this qualifies as bug or feature request actually.

[rgs1]

maybe related to #9669.

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[github-actions]

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