feature: Add expected hashrate to API

[b-rowan]

It would be nice to have the expected hashrate shown in the API directly to make it a bit easier for external tools to parse it. AFAIU there is some calculation being done involving cores, frequency, etc, to find this value.

I am happy to PR this if someone can start me in the right direction as to where to source this.

[jns-codeworks]

I think it is this line:

this.expectedHashRate$ = this.info$.pipe(map(info => { return Math.floor(info.frequency * ((info.smallCoreCount * info.asicCount) / 1000)) }))

source