Add SSD1306 128x64 OLED Display Support for DEVKITV1

[LEE-CHI-HSUAN]

This PR introduces support for common 0.96" (128x64) SSD1306 OLED displays, primarily for ESP32 devices using the DEVKITV1 configuration. It allows users to monitor real-time mining status, time, and global device information directly on an inexpensive OLED.

Key Changes

• New Display Driver: src/drivers/displays/oled096DisplayDriver.cpp for SSD1306 128x64 OLEDs.
  • Implements loading, setup, and three main screens (Miner States, Clock, Global States).
  • Implements display rotation and the ability to turn the display on/off.
  • References the established tDisplayDriver.
• U8G2 Library: Integrated via lib_deps (see sample in platformio.ini).
• New Build Flag: -D DEVKITV1_096_OLED added to platformio.ini for easy activation.
• I2C Pin Configuration: I2C pins (default: SDA=GPIO5, SCL=GPIO6) are configurable in platformio.ini.

How to Enable

1. Change the build flag from DEVKITV1 to DEVKITV1_096_OLED in platformio.ini.
2. Adjust I2C SDA/SCL pins in platformio.ini if different from the defaults (5/6).
3. Wire your 128x64 SSD1306 OLED to the configured I2C pins.
4. Build and upload using PlatformIO.

Testing

Tested on an ESP32-C3 Super Mini with a 128x64 SSD1306 OLED. Firmware uploads correctly, displays loading/setup screens, and cycles through accurate miner status, clock, and global state screens.