Add more debug level logs to SDK

[Fahad Heylaal]

Background

• SDK allows log levels to be set, including debug: https://featurevisor.com/docs/sdks/#levels
• You can also enable verbosity when running test specs, and those debug logs will appear: https://featurevisor.com/docs/testing/#verbose

Add more debug logs

Places I can think of:

• https://github.com/featurevisor/featurevisor/blob/main/packages/sdk/src/instance.ts#L458

Basically wherever we return evaluation;, the line before should ideally emit a debug log.

Why?

We can debug more precisely when we are in tricky spots to understand why some evaluations are working the way they are, either correctly or incorrectly.