Service Provider Promotions again

[michaeldjeffrey]

Proto PR :: helium/proto#424
Please scrutinize the names.

Previously

• incentive_escrow_fund_bps was stored in Solana, and written to s3.
• Promotions were submitted daily, and could point at a Subscriber or Gateway.

Now

• incentive_escrow_fund_bps and promotions are stored in the metadata_db.
• Promotions are pointed to by special NFTs.
• Share logic works the same
• PromotionDaemon has been removed

Temporary metadata_db table creation

I am testing with a local table until incentive programs make it into the metadata_db proper.
Using the Column mapping and Account Structure I have the following table.

CREATE TABLE incentive_escrow_programs (
    address character varying(255) NOT NULL,
    carrier character varying(255) NULL,
    start_ts numeric NULL,
    stop_ts numeric NULL,
    shares integer NULL,
    bump_seed integer NULL,
    name character varying(255) NULL,
    refreshed_at timestamp with time zone NULL,
    created_at timestamp with time zone NOT NULL
  );