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Add CH1115 128x64 I2C OLED driver (#400)

* Add CH1115 128x64 I2C OLED driver

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* refactor: simplify bit mapping in ch1115 display

Update the `display` method in the `ch1115` driver to use a loop for
mapping image pixels into the buffer bytes.

- Replaces unrolled bitwise operations with a cleaner loop.
- Improves code readability and maintainability.
- Fixes minor comment alignment in the initialization sequence.

* feat: add support for CH1115 display driver

- Update `README.rst` and `setup.cfg` to include **CH1115** in the
  supported chipset list.
- Add **@WikiZell** to the `CONTRIBUTING.rst` file.

* test: add unit tests for CH1115 OLED device

-   Verify initialization sequence for 128x64 resolution.
-   Ensure `DeviceDisplayModeError` is raised for invalid dimensions.
-   Validate rendering primitives against baseline reference data.

```mermaid
sequenceDiagram
    participant T as Test Suite
    participant C as CH1115 Driver
    participant S as Serial Mock

    T->>C: Initialize(serial)
    C->>S: Send initialization commands
    C->>S: Send 1024 bytes (zeros) to clear RAM
    T->>C: Render canvas primitives
    C->>S: Send display commands and image data
    T->>T: Compare recordings with demo_ch1115.json
```

* doc: add CH1115 support and sh1106 rotation fix to changelog

- Update `CHANGES.rst` and documentation for the **3.15.0** release.
- Update copyright headers in test files.

---------

Co-authored-by: Richard Hull <rm_hull@yahoo.co.uk>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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