Support custom path for tsr.config.json

[andrew-kuczynski]

Hello I noticed something not possible that I think some might appreciate-

It'd be useful to support putting tsr.config.json somewhere other than the project root, for people who want to hide the litany of config files cluttering the repo root (a sisyphean task I know)

Something like:

tsr generate --config ./config/tsr.json
tsr watch --config ./config/tsr.json

And ideally an equivalent option for the Vite/Start plugins so they all use the same config path.

One important detail: config location probably shouldn't change the project root used to resolve things like routesDirectory.

Happy to open a PR if others agree.

Thanks