Develop a soak test for the Vrl Bytecode VM

[StephenWakely]

Ref #9515

It would be highly useful to have some accurate benchmarks for the work in #9829 so we can ascertain how much of a benefit moving Vrl to compile and run with a Bytecode VM.

A useful config to test with would be:

[sources.in]
type = "http"
address = "0.0.0.0:8080"
encoding = "text"

[transforms.remap]
type = "remap"
inputs = ["in"]
source = '''
.hostname = "vector"

if .status == "warning" {
  .thing = upcase(.hostname)
} else if .status == "notice" {
  .thung = downcase(.hostname)
} else {
  .nong = upcase(.hostname)
}

.matches = { "name": .message, "num": "2" }
.origin, .err = .hostname + "/" + .matches.name + "/" + .matches.num
'''

[sinks.blackhole]
type = "blackhole"
inputs = ["remap"]

SHA to test against: 9d6108d

[blt]

Blocked pending #9818.

[StephenWakely]

Lading config:

worker_threads = 10
prometheus_addr = "0.0.0.0:9001"

[targets.simple]
target_uri = "http://localhost:8080/"
bytes_per_second = "5000 Mb"
parallel_connections = 100
method.type = "Post"
method.variant = "Json"
method.maximum_prebuild_cache_size_bytes = "500 Mb"

[targets.simple.headers]
dd-api-key = "deadbeef"