add a flag to the CLI to enable debug mode

[wdbaruni]

We need a convenient method and common logic to enable debug mode. Today, we are mainly relying on zerolog logging level to know if we are in debug mode or not and using that in multiple places including:

1. Deciding if our API server is in debug mode or not, which results in returning the internal error back to the clients.

   bacalhau/pkg/publicapi/server.go

   Line 93 in ce04ff7

   if zerolog.GlobalLevel() <= zerolog.DebugLevel {

2. Deciding if we should print all history internal details to the console

   bacalhau/cmd/util/cols/history.go

   Line 63 in 2540a99

   if zerolog.GlobalLevel() <= zerolog.DebugLevel {

3. Also deciding on printing stacktrace when facing client errors

First, we need a more explicit way to enable debug more rather than infering from the logging level
Second, we need an easy way to expose that back to the user