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json: make the json streamer a template class

/retest

json: make the json streamer a template class

/retest

json: make the json streamer a template class

I still think it's weird to include .cc in a .h file (Although I know there are some similar cases in real world. But obviously, we can avoid that here)....

json: make the json streamer a template class

Force update is used because re-organization of commits.

json: make the json streamer a template class

The benchmark result of previous stats handler: ``` ---------------------------------------------------------------------------------------------- Benchmark Time CPU Iterations ---------------------------------------------------------------------------------------------- BM_AllCountersJson/per_endpoint_stats_disabled 590 ms 590 ms 1 output per iteration: 135789011 [2024-08-28 10:20:15.902][265134][error] [test/server/admin/stats_handler_speed_test.cc:163] Initializing cluster info;...

json: make the json streamer a template class

Replaced by #36001

remove H2 header normalisation runtime guard

could you check the CI? Thanks.

access log: new 20x faster json formatter implementation

/wait

access log: new 20x faster json formatter implementation

exception...

access log: new 20x faster json formatter implementation

Fine, most comments are addressed. There are two problems: - the substitution_formatter.h is depended by the envoy-mobile. But the `sanitize` introduce a exception on the core data path. - `serializeDubbo`...