feat: cns logger v2 [1/2]

[rbtr]

Adds v2 logger package for CNS. [1/2]

The v2 logger is built with zap and offers structured logging, derived contexts, multiple output targets and formats including stdout, files, ETW, and AppInsights.
The logger constructor is opinionated and will initialize targets and formats fully based on what is supported per-platform. The logger is intended to be used directly.

This pt. 1 change is strictly the addition of the v2 logger package machinery.

[rbtr]

The ETW changes will drop out as #3433 merges.

[Copilot]

Copilot reviewed 6 out of 12 changed files in this pull request and generated 4 comments.

Files not reviewed (6)

• go.mod: Language not supported
• cns/logger/cnslogger_windows.go: Evaluated as low risk
• cni/log/logger_windows.go: Evaluated as low risk
• zapetw/core_windows.go: Evaluated as low risk
• cns/logger/v2/logger_linux.go: Evaluated as low risk
• cns/logger/v2/logger_windows.go: Evaluated as low risk

Comments suppressed due to low confidence (1)

cns/logger/v2/cores/etw_windows.go:17

• The comment should specify that the second return value is a function to close the provider for clarity.

// The first return is the core, the second is a function to close the sink.

[rbtr]

/azp run Azure Container Networking PR

[jpayne3506]

/azp run Azure Container Networking PR

[azure-pipelines]

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