PATCH Method with no Body (#2770)

* refactor(core, tests): standardize method visibility and add HTTP/1.0 body handling tests

- Changed `@BeforeAll` and `@AfterAll` annotations to non-static for consistency.
- Reorganized test setup and teardown logic to ensure proper resource management.
- Added test cases for HTTP/1.0 requests with and without bodies.
- Introduced `PATCH_EMPTY_BODY` and improved input stream naming for clarity.
- Updated `shouldNotContainBody` logic to handle HTTP/1.0 requests correctly.

* refactor(tests): update constants, improve teardown, and standardize variable declarations

* refactor(core, tests): encapsulate `method` and `uri` fields in `Request`

- Replaced direct field access with `setMethod` and `setUri` to improve encapsulation.
- Adjusted `RequestTest` to use setters for `method` and `uri`.

* refactor(core): replace `add` with `setContentType` in `Request.Builder` for header consistency

Author: predic8