Log a message if file system caching is disabled on coordinator

[developer-x]

Description

If a connector does not support caching on a Coordinator, Trino instantiates Alluxio JMX statistics but quietly disables caching. As a result, it appears that caching is instantiated and is operating. Consequently, it's really confusing when caching doesn't work but there is no indication why.

This PR will issue a warning on startup to let the user know that caching has been disabled for the Coordinator.

Considering this is a trivial PR, I didn't create a ticket. But if that is appropriate, I will open an issue.

Additional context and related issues

N/A

Release notes

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[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: Andrew Hall.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email [email protected]
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[ebyhr]

Please submit CLA if you haven't sent it.

[developer-x]

I sent it yesterday to ***@***.***