feat: make field max length configurable #206

Benchdiff Results

Benchmark Command: go test ./... -run ^ -bench . -count 5 -benchtime 100ms -cpu 1,2 -benchmem

HEAD sha: 766fc0b

Base sha: 99f84c0

Degraded: false

pkg: github.com/elastic/apm-data/codec
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
Encode/format=json	25058	1%	26234.6	1%	+4.70%	(p=0.008 n=5+5)
Encode/format=json-2	13277.6	4%	13676	1%	~	(p=0.151 n=5+5)
Encode/format=vtproto	4781.4	2%	4622.8	2%	-3.32%	(p=0.008 n=5+5)
Encode/format=vtproto-2	2578.8	1%	2779	14%	~	(p=0.151 n=5+5)
Decode/format=vtproto	18804.6	2%	18796.5	0%	~	(p=0.905 n=5+4)
Decode/format=vtproto-2	10844.6	3%	11156.8	4%	~	(p=0.095 n=5+5)
Decode/format=json	128841	8%	125969	2%	~	(p=1.000 n=5+5)
Decode/format=json-2	67244.8	7%	67062	3%	~	(p=0.841 n=5+5)

name	old bytes/op (bytes/op)	±	new bytes/op (bytes/op)	±	delta	±
Encode/format=json	6564	0%	6564	0%	~	(all equal)
Encode/format=json-2	6564	0%	6564	0%	~	(all equal)
Encode/format=vtproto	2775	0%	2775	0%	~	(all equal)
Encode/format=vtproto-2	2775	0%	2775	0%	~	(all equal)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
Encode/format=json	7592	0%	7592	0%	~	(all equal)
Encode/format=json-2	7593	0%	7593	0%	~	(all equal)
Encode/format=vtproto	3072	0%	3072	0%	~	(all equal)
Encode/format=vtproto-2	3072	0%	3072	0%	~	(all equal)
Decode/format=vtproto	12952	0%	12952	0%	~	(all equal)
Decode/format=vtproto-2	12952	0%	12952	0%	~	(all equal)
Decode/format=json	14281.4	0%	14282.8	0%	~	(p=0.103 n=5+5)
Decode/format=json-2	14283	0%	14281.6	0%	~	(p=0.079 n=5+5)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
Encode/format=json	26	0%	26	0%	~	(all equal)
Encode/format=json-2	26	0%	26	0%	~	(all equal)
Encode/format=vtproto	1	0%	1	0%	~	(all equal)
Encode/format=vtproto-2	1	0%	1	0%	~	(all equal)
Decode/format=vtproto	348	0%	348	0%	~	(all equal)
Decode/format=vtproto-2	348	0%	348	0%	~	(all equal)
Decode/format=json	379	0%	379	0%	~	(all equal)
Decode/format=json-2	379	0%	379	0%	~	(all equal)

pkg: github.com/elastic/apm-data/input/elasticapm/internal/decoder
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
NDStreamDecoder	284.18	1%	278.98	4%	-1.83%	(p=0.032 n=5+5)
NDStreamDecoder-2	157.14	12%	148	9%	~	(p=0.095 n=5+5)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
NDStreamDecoder	72	0%	72	0%	~	(all equal)
NDStreamDecoder-2	72	0%	72	0%	~	(all equal)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
NDStreamDecoder	4	0%	4	0%	~	(all equal)
NDStreamDecoder-2	4	0%	4	0%	~	(all equal)

pkg: github.com/elastic/apm-data/model/modeljson
goos: linux
goarch: amd64

name	old time/op (ns/op)	±	new time/op (ns/op)	±	delta	±
APMEventToJSON/to-json	15990.4	12%	15437.6	9%	~	(p=0.095 n=5+5)
APMEventToJSON/to-json-2	13152.4	2%	13008.8	2%	~	(p=0.421 n=5+5)

name	old alloc/op (B/op)	±	new alloc/op (B/op)	±	delta	±
APMEventToJSON/to-json	2616	0%	2616	0%	~	(all equal)
APMEventToJSON/to-json-2	2616	0%	2616	0%	~	(all equal)

name	old allocs/op (allocs/op)	±	new allocs/op (allocs/op)	±	delta	±
APMEventToJSON/to-json	38	0%	38	0%	~	(all equal)
APMEventToJSON/to-json-2	38	0%	38	0%	~	(all equal)