bridge: in-place debugging using dlv

[leoluk]

Stack from ghstack:

• bridge: log submission for cross-submissions to Solana #54 bridge: log submission for cross-submissions to Solana
• bridge: do not resubmit submitted VAAs during aggregation #53 bridge: do not resubmit submitted VAAs during aggregation
• bridge: do not log errors for duplicate VAA submissions #52 bridge: do not log errors for duplicate VAA submissions
• bridge: have all nodes submit VAAs to Solana #51 bridge: have all nodes submit VAAs to Solana
• bridge/pkg/solana: retry VAA submission on transient errors #48 bridge/pkg/solana: retry VAA submission on transient errors
• agent: return gRPC Internal error on submission failure #47 agent: return gRPC Internal error on submission failure
• bridge: move initial guardian set fetching to pkg/ethereum/watcher.go #46 bridge: move initial guardian set fetching to pkg/ethereum/watcher.go
• bridge: propagate panics from runnables #45 bridge: propagate panics from runnables
• bridge: in-place debugging using dlv #44 bridge: in-place debugging using dlv

Optional support for in-place debugging using an external
IDE debugger. Disabled by default.

The dlv binary is always compiled in the Dockerfile -
this is cheap due to it only depending on go.mod.

[hendrikhofstadt]

Why is this commented out? You could always run it with delve and use --continue to not block and wait for a debugger to be attached (for anyone trying to debug right from the start, this could then be commented out)?