[Enhancement] add doc for diagnostic API

[jessegoodier]

Description

https://steven.dev-1.aws.kubecost.xyz/model/diagnostic/derivationRecords
https://steven.dev-1.aws.kubecost.xyz/model/diagnostic/databaseDirectory
https://steven.dev-1.aws.kubecost.xyz/model/diagnostic/ingestionRecords

the query parameters work like this:
https://steven.dev-1.aws.kubecost.xyz/model/diagnostic/ingestionRecords?window=1d&fileSize=%3C150
note that greater than and less than are =< and =>

@saweber If you have more detail that you can copy and paste here, please do.
Not urgent.

@bstuder99 FYI

[chipzoller]

@jessegoodier, can we get this in for 2.3?

[jessegoodier]

@jessegoodier, can we get this in for 2.3?

we had to pull this out. As of now, it will not be in 2.3.0