add snowflake detector

[zubairk14]

Resolves #1607

Description:

Explain the purpose of the PR.

• Detect Snowflake secrets (compound URI of account, username, password)
• Enrich Secret Result with account and databases that the secret has access to.

Checklist:

• Tests passing (make test-community)?
• Lint passing (make lint this requires golangci-lint)?

[rosecodym]

in addition to my in-line comment, an indeterminate failure test would be nice if it's feasible

[rosecodym]

The presence of a verification error (which is possible above) signals that the detector wasn't able to determine whether the candidate credentials are valid. That's not really consistent with setting Verified to true (which means that we know that the credentials are valid) - the framework assumes that you won't combine those two things, so you shouldn't. I'm not sure what the best solution here is - maybe putting those error messages somewhere else in the Result payload?

(I know that making this fourth "verification state" mathematically possible but forbidding its use is kind of weird, but it's the price we pay for being able to migrate detectors gradually.)

[zubairk14]

ahh - good point

concerns addressed