font: add anti-aliasing and other features (#6198)

* Pack glyph bits

* Use unsigned chars for unicode strings.

* Implement multi-bit glyphs

* clang-format

* Allow extra glyphs to be added to a font

* Allow .otf and .woff file extensions

* Add printf versions with background color;
Add tests

* Whitespace...

* Move font test to new framework

* CI fix

* CI fix

* CODEOWNERS

* File extensions tested as case-insensitive

tests/components/font/test.esp32.yaml

@@ -0,0 +1,27 @@
+font:
+  - file: "gfonts://Roboto"
+    id: roboto
+    size: 20
+    glyphs: "0123456789."
+    extras:
+      - file: "gfonts://Roboto"
+        glyphs: ["\u00C4", "\u00C5", "\U000000C7"]
+
+spi:
+  clk_pin: 14
+  mosi_pin: 13
+
+display:
+  - id: my_display
+    platform: ili9xxx
+    dimensions: 480x320
+    model: ST7796
+    cs_pin: 15
+    dc_pin: 21
+    reset_pin: 22
+    transform:
+      swap_xy: true
+      mirror_x: true
+      mirror_y: true
+    auto_clear_enabled: false
+