Add a ``poll_tickers`` coro which can be used to "stream" quotes at
a requested rate. Expose through a cli subcommand `piker stream`.
Drop the `pikerd` command for now.
- colorize json response data in logs
- support ``refresh_token`` retrieval from user if the token for some
reason expires while the client is live
- extend api method support for markets, search, symbols, and quotes
- support "proxying" through api calls via an ``api`` coro for one off
client queries (useful for cli testing)
Store tokens in a local config file avoiding any refresh delay
unless necessary when the current access token expires.
Summary:
- move draft main routine into the `brokers` package mod
- start an api wrapper type
- always write the current access tokens to the config on teardown