chore(build): strip debug symbols using strip -g

[taegyunkim]

What does this PR do?

Run strip -g on all .so files in ddtrace to make sure that they're stripped of debug symbols to reduce the layer size.

This is needed to unblock DataDog/dd-trace-py#14286, which aims to build dd-trace-py with debug symbols by default.

The more right thing to do would be using pre-built wheel always instead of building from sources.

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
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