feat: JSON log encoder uses abbreviated field keys

[zirain]

fixes: #8552

the output as following:

{"level":"info","ts":1773900658.0818536,"logger":"provider","caller":"kubernetes/controller.go:1202","msg":"processing OIDC HMAC Secret","runner":"provider","namespace":"envoy-gateway-system","name":"envoy-oidc-hmac"}
{"level":"info","ts":1773900658.0818622,"logger":"provider","caller":"kubernetes/controller.go:1224","msg":"processing Envoy TLS Secret","runner":"provider","namespace":"envoy-gateway-system","name":"envoy"}
{"level":"info","ts":1773900658.0820184,"logger":"provider","caller":"kubernetes/controller.go:557","msg":"No gateways found for accepted GatewayClass","runner":"provider","trace_id":"b30673449e19b35ed56c38140f7f882e","span_id":"168c82967f8a79f9","GatewayClass":"internet"}
{"level":"info","ts":1773900658.0822415,"logger":"provider","caller":"kubernetes/controller.go:600","msg":"reconciled gateways successfully","runner":"provider","trace_id":"b30673449e19b35ed56c38140f7f882e","span_id":"168c82967f8a79f9"}

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.35%. Comparing base (a049df2) to head (d092626).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8555   +/-   ##
=======================================
  Coverage   74.35%   74.35%           
=======================================
  Files         242      242           
  Lines       37811    37811           
=======================================
+ Hits        28113    28114    +1     
+ Misses       7748     7747    -1     
  Partials     1950     1950           

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[arkodg]

is another API needed, or should this be enabled by default ?

[zirain]

is another API needed, or should this be enabled by default ?

this only reason for a new API i could image is not breaking the existing users.

[arkodg]

imo making this opt in feels more non intuitive, wdyt @envoyproxy/gateway-maintainers

[zirain]

imo making this opt in feels more non intuitive, wdyt @envoyproxy/gateway-maintainers

After review this:

1. For Text encoder, seems nothing is changed.
2. For JSON encoder, production encoder config is better.

So I changed to use production config by default with a breaking change notes.