sst: Create a configPrefix global option for the dev command

[mikeki]

I'm working on a monorepo that will define different configs in the same directory, and I noticed that we only allow 1 config.

This change will provide the option of specifying a prefix to the config file:
e.g.

sst dev --configPrefix web/

The previous command would look for the config at web/sst.config.ts instead of only ever having the option of sst.config.ts.

This way we can run the sst dev command from the root level and work on any sub-package

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[jayair]

Hmm this is an interesting pattern. Can you open a help thread in Discord? I've got a couple of questions.

[mikeki]

@jayair I don't have a discord account, let me create one in the next couple days so that we can discuss.