Band Feature: Reserved Providers

[sorawit]

Motivation

Currently the way TCD works does not encourage more data providers beyond the active ones. Thus, if a provider goes offline or stops providing data, adding a new data provider may not be as smooth. Looking at EOS, for example, reserved validator nodes are in place to prevent such situation. Band should also have that.

Suggested Implementation

1. Add two governance parameters: reserved_providers_count and reseved_reward_percentage.
2. Whenever distributeFee function is called, also split some revenue to the reserved providers.