feat: Snowflake adapter

[oliverlambson]

Closes #23

Implemented a Snowflake adapter using gosnowflake.

Steps followed

1. Add gosnowflake dependency: go get -u github.com/snowflakedb/gosnowflake@latest This changed a lot of go.mod and I have no idea if that's expected behaviour (I assumed it would only add required deps, but it seems to have bumped a bunch of versions too. I'm not a go dev, sorry)
2. Use Redshift adapter files as base templates and modify to work with gosnowflake
3. Update SQL queries for Driver and Helpers
4. Test locally in nvim-dbee I did this by building the binary (go build) and replacing the default binary that the nvim-dbee lua config points to (in my case at /Users/oliverlambson/.local/share/nvim/dbee/bin/dbee, I'm on an M1 Mac)

Manual testing

(sorry had to redact everything because I don't have a dummy snowflake to play with)

[Slanman3755]

Bumping this. What would it take to get this merged?