Add "platform" benchmarks

[adamsitnik]

We should add a console line arguments that allows to use the "platform" TE configuration.

https://github.com/aspnet/Benchmarks/blob/9cffccb8ad4579b23f5ece871ef537ff6afb6e43/src/BenchmarksApps/Kestrel/PlatformBenchmarks/Program.cs#L23-L44

[tmds]

@adamsitnik is this still something we want to do? Any particular benchmark we want to run from these? Plaintext/Json?

cc @antonfirsov

[tmds]

Re-open to collect benchmark result.

[tmds]

@antonfirsov let's run a single benchmark for platform on Citrine:

e=epoll
a=true
c=inline
i=inline
o=inline
p=true
t=ProcessorCount

[antonfirsov]

For this configuration:

RequestsPerSecond:           1,272,299
Max CPU (%):                 100
Avg. Latency (ms):           0.4

I guess we also want to run Config1/2/3/4 from here?