feat: integrate OpenTelemetry in opengemini-client-go

[chenhuansome]

1. What is the main purpose of this PR?

Add OpenTelemetry support to the OpenGemini Go client to implement distributed tracing, metric collection, and log aggregation. The data format adheres to the OpenTelemetry protocol (OTLP), and it supports integration with mainstream observability tools such as Prometheus and Jaeger.

2. What is the purpose of defining interceptor - related interfaces in the code?

The  Interceptor  interface is defined, which includes the  Query  and  Write  methods. It is used to standardize the interception logic for handling query and write operations and provide a standard for subsequent interceptor implementations.

3. What does  OtelClient  do specifically as an interceptor?

OtelClient  uses OpenTelemetry for distributed tracing. It extracts and injects tracing context before the request and sets relevant attributes; after the request, it records information such as the response status.

4. How do interceptors work in the logic related to  Client ?

Client  supports adding multiple interceptors. Before and after executing an HTTP request, the closure functions of the interceptors are called in sequence, thereby enhancing the scalability of request processing and allowing additional operations to be inserted during the request lifecycle.

[xuthus5]

the format of the commit message content does not comply with the specifications.

it must be type: content not type:content.