eBPF unit test: add proposal

[sancppp]

What type of PR is this?

/kind enhancement
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #1209

Special notes for your reviewer:

• 调研Cilium项目的eBPF单元测试框架
• 设计、实现Kmesh eBPF单元测试框架
• 添加测试用例

Does this PR introduce a user-facing change?:

NONE

[kmesh-bot]

@sancppp: The label(s) kind/documentation cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind enhancement
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #1209

Special notes for your reviewer:

• 调研Cilium项目的eBPF单元测试框架
• 设计、实现Kmesh eBPF单元测试框架
• 添加测试用例

Does this PR introduce a user-facing change?:

NONE

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[kmesh-bot]

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[kmesh-bot]

Welcome @sancppp! It looks like this is your first PR to kmesh-net/kmesh 🎉

[sancppp]

CC @tacslon .
This pull request introduces a comprehensive eBPF unit testing framework for the Kmesh project, inspired by the Cilium project's testing framework. The documentation is provided in both English and Chinese. The most important changes include the background and design approach for the framework, detailed descriptions of the sample Cilium eBPF unit testing framework, and the specific design of the Kmesh eBPF unit testing framework.

Documentation and Framework Design:

• docs/ebpf_unit_test.md: Added detailed documentation for the Kmesh eBPF Unit Testing Framework, including background, design approach, and specific design components.
• docs/ebpf_unit_test_zh.md: Provided a Chinese translation of the Kmesh eBPF Unit Testing Framework documentation, covering the same detailed aspects as the English version.