Send logs via Sentry CLI

[AbhiPrasad]

Description

Sentry now supports structured logging. Let's add it to sentry-cli.

1. Build a CLI command that takes a log payload and sends it to Sentry. I'm thinking something similar in structure to https://github.com/getsentry/sentry-cli/tree/master/src/commands/send_metric
2. Build functionality that allows you to pipe some output stream (think stdout) to sentry-cli and send logs to sentry.

We should be able to use sentry-cli for the https://github.com/HazAT/sentry-node-nginx-logger use case.