Feature request: overwrite existing database, but ask first

I'm auditing a customer application. Their build system has never been set up for CodeQL, so there's a lot of tweaking and setup that has to be figured out to get it all working. Naturally, as part of this process, I'm running `codeql database create [...] --overwrite` a bunch of times as I iterate through all the build issues to fix stuff.

Finally, in a joyous moment, the build _actually runs!_

I wait 25 minutes for it to build, get the success report, then excitedly hit up a couple of times in my terminal to run my last `codeql database analyze` command. But I'm a clumsy oaf, and in all the excitement I accidentally run the `codeql database create [...] --overwrite` command again. WHAM. Whole database gone. I resign myself to waiting another 25 minutes for the build to complete and go stare into the void for a while.

Please save me from myself by adding an `--overwrite=ask` option (or similar) that prints a warning and requires me to write something like "yes" before doing the overwrite. Thanks.

Start with the `codeql database create` command and its existing `--overwrite` behavior. Determine how an interactive confirmation option should be exposed and verify that an overwrite warning blocks the operation until confirmation is provided.

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