Connect to redis database once, not on each request

[chrisjsimpson]

Previoulsy the stripe connect account announcer would

1. Connect to redis

   stripe-connect-account-announcer/app.ts

   Line 11 in 1f3da1d

   const redisConn = await Deno.connect({hostname: REDIS_HOSTNAME, port: Number(REDIS_PORT)})

2. Re-use the redis database connectino for each request:

   stripe-connect-account-announcer/app.ts

   Line 18 in 1f3da1d

   redisConn.write(encoder.encode(`AUTH ${REDIS_PASSWORD}\n\n`));

However the python version creates a new connection to redis for every request (not needed), because redis_set_value creates a new connection each time.

Solution you'd like:

Use the same pattern for the python version: Connect to reddis, re-use the connection for each request.