feat: Refactor the log library of milvus, support scoped context logging

[chyezh]

issue: milvus-io/milvus#35917

Summary

This PR implements the mlog package - a context-aware logging library built on
https://github.com/uber-go/zap, designed specifically for Milvus distributed systems.

Key Features

Mandatory Context Passing - All logging operations require a context, ensuring request traceability
Zero-Overhead Abstraction - Uses type aliases to avoid wrapper overhead, performance comparable to
direct zap usage
Automatic Field Accumulation - Context fields automatically accumulate through the call chain, child
contexts inherit parent fields
Cross-Service Propagation - Supports propagating key fields via gRPC metadata for distributed tracing
Lazy Encoding - Uses WithLazy for deferred field encoding, avoiding encoding overhead when log level
is disabled
Component-Level Logger - Provides optimized Logger type that selects the logger with more pre-encoded
fields to minimize runtime encoding

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chyezh
To complete the pull request process, please assign yanliang567 after the PR has been reviewed.
You can assign the PR to them by writing /assign @yanliang567 in a comment when ready.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment