Support for tail based sampling?

[numirov]

Is your feature request related to a problem? Please describe.
We want to have more control over sampling in our application.

1. Don't record dependencies that are less than 100ms(successpath), but record everything that is >100ms. (numbers are arbitrary)
2. Record 100% failed telemetry(span/trace/etc) as described here Problem to configure sampling override #3511 . Recording only exception doesn't give much context if everything surrounding it is sampled.
   We want to lower our costs but also have useful telemetry, I believe having tail based sampling would greatly help us.

Describe the solution you would like
Add support for tail based sampling to have more control?

Describe alternatives you have considered
Describe any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.