Print NginxConfig in JSON format for debug and trace levels

[dareste]

Proposed changes

This PR changes the log.traceF and log.debugF function arguments in those cases where we log the NginxConfig protobuf message. Instead of the raw message (which is harder to parse and read when doing troubleshooting), the JSON version of the object is now logged.

Closes #209

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

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[dhurley]

Can you run make deps as well?

[dareste]

@dhurley make deps is failing in my fork:

fatal: No names found, cannot describe anything.
cd sdk && go mod tidy && go mod vendor && make generate && go mod tidy && go mod vendor
go: finding module for package github.com/nginx/agent/sdk/v2/proto/events
go: finding module for package github.com/nginx/agent/sdk/v2/proto
github.com/nginx/agent/sdk/v2 imports
github.com/nginx/agent/sdk/v2/proto: no matching versions for query "latest"
github.com/nginx/agent/sdk/v2/client imports
github.com/nginx/agent/sdk/v2/proto/events: no matching versions for query "latest"
make: *** [deps] Error 1

[dhurley]

Hi @dareste, I think there are 2 things you need to do before running make deps.

1. Install protoc https://grpc.io/docs/protoc-installation/
2. Run make install-tools

These 2 things only need to be done the first time you start using the agent.
I will be creating another PR to update the README with these instructions.

Let me know if this resolves your issue.

[Dean-Coakley]

LGTM once vendor dir is updated: #210 (comment)

[oliveromahony]

make deps looks outdated, I'll do a separate PR for that