launchdarkly-cpp-client-v3.11.0-beta.3

fix: Correctly handle a wrapper name without a wrapper version. (#499)

BEGIN_COMMIT_OVERRIDE
fix: Correctly handle a wrapper name without a wrapper version.
chore: Add support for the wrapper contract tests.
END_COMMIT_OVERRIDE

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Properly handle wrapper name without version in HTTP headers and add
wrapper config/capability to contract tests.
> 
> - **Common HTTP properties**:
> - `HttpPropertiesBuilder::Build`: Set `X-LaunchDarkly-Wrapper` to just
`wrapper_name` when `wrapper_version` is empty; otherwise
`name/version`.
> - **Contract tests**:
> - **Data model**: Add `ConfigWrapper` and optional
`configuration.wrapper` in `ConfigParams`.
> - **Entity managers**: Use
`HttpProperties().WrapperName/WrapperVersion` when
`configuration.wrapper` provided (client and server).
> - **Capabilities**: Advertise `"wrapper"` in client and server test
services.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
2154d6eef9b84607c4a631a615e059db2d588e45. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->