Support custom SSL certificates in audio_http

Some users started using custom certificates on the VPE firmware when it used the ``http_request`` component for audio. The firmware now uses `audio_http` component which doesn't use certificates defined in `http_request`.

`audio_http` does support it through the microDecoder library, which added supported in (https://github.com/esphome-libs/micro-decoder/pull/14) released in [v0.3.0](https://github.com/esphome-libs/micro-decoder/releases/tag/v0.3.0)

ESPHome needs to update the micro-decoder library version to v0.3.0. Then it needs to send the certificate in the micro-decoder configuration. It also needs a way to configure it in the Python codegen (or automatically use a certificate defined in http_request potentially...)

Would fix https://github.com/esphome/esphome/issues/16557