Remove snapshot command in client CLI

[jpraynaud]

Why

We need to remove the deprecated snapshot command of the client CLI. It will be released with the next distribution (2423).

What

Remove the command and warn our users that the command will be removed so that they can use the new cardano-db command instead.

How

• Remove the snapshot command in the client CLI
• Add an error message when snapshot command is used or when a command is not found (but snapshot is not displayed anymore in the help)
• Remove the snapshot command in the documentation
• Update the minor version of the client CLI as it is a breaking change
• Update CHANGELOG.md
• Warn in advance all users with an announcement in slack/discord

Later

• Create a blog post when distribution is released