Add runtime online image support (#4710)

tests/components/online_image/common-esp32.yaml

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+<<: !include common.yaml
+
+spi:
+  - id: spi_main_lcd
+    clk_pin: 16
+    mosi_pin: 17
+    miso_pin: 15
+
+display:
+  - platform: ili9xxx
+    id: main_lcd
+    model: ili9342
+    cs_pin: 12
+    dc_pin: 13
+    reset_pin: 21
+    lambda: |-
+      it.fill(Color(0, 0, 0));
+      it.image(0, 0, id(online_rgba_image));

tests/components/online_image/common-esp8266.yaml

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+<<: !include common.yaml
+
+spi:
+  - id: spi_main_lcd
+    clk_pin: 14
+    mosi_pin: 13
+    miso_pin: 12
+
+display:
+  - platform: ili9xxx
+    id: main_lcd
+    model: ili9342
+    cs_pin: 15
+    dc_pin: 3
+    reset_pin: 1
+    lambda: |-
+      it.fill(Color(0, 0, 0));
+      it.image(0, 0, id(online_rgba_image));

tests/components/online_image/common.yaml

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+wifi:
+  ssid: MySSID
+  password: password1
+
+# Purposely test that `online_image:` does auto-load `image:`
+# Keep the `image:` undefined.
+# image:
+online_image:
+  - id: online_binary_image
+    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
+    format: PNG
+    type: BINARY
+    resize: 50x50
+  - id: online_binary_transparent_image
+    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
+    type: TRANSPARENT_BINARY
+    format: png
+  - id: online_rgba_image
+    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
+    format: PNG
+    type: RGBA
+  - id: online_rgb24_image
+    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
+    format: PNG
+    type: RGB24
+    use_transparency: true
+
+# Check the set_url action
+time:
+  - platform: sntp
+    on_time:
+      - at: "13:37:42"
+        then:
+          - online_image.set_url:
+              id: online_rgba_image
+              url: http://www.example.org/example.png
+

tests/components/online_image/test.esp32-ard.yaml

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+<<: !include common-esp32.yaml
+
+http_request:
+  verify_ssl: false

tests/components/online_image/test.esp32-idf.yaml

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+<<: !include common-esp32.yaml
+
+http_request:
+