Remove stale Presto modules from the main repository

[wanglinsong]

Presto has about 100 submodules, some of which rarely get updated from one release to another. Even there are some updates, most of the updates are about bug fixes and dependency updates.
This happens especially on connector plugins.

• Too many submodules in the repository greatly slow down the development velocity, from building and testing perspective.
• The final presto server package and docker image are huge in size, affect the deployment process

Expected Behavior or Use Case

We will identify these submodules and create separate repositories in GitHub prestodb org.
For each of these repositories, we will also provide release pipelines, and other supports, to ensure the compatibility with the updated Presto.

Presto Component, Service, or Connector

We will start with connectors.

Updates

• presto-cassandra
• presto-druid

[wanglinsong]

@tdcmeehan Please help with identifying the submodules.

[elharo]

presto-druid and presto-cassandra are two obvious targets.