feat(esp8266): add BearSSL TLS support#1
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This adds the BearSSL transport path and the supporting SSL hooks needed by downstream fingerprint-based MQTT clients.
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Summary
Add BearSSL-backed TLS support for ESP8266.
This adds the BearSSL transport path and the SSL hooks needed by downstream clients that open secure TCP connections and rely on fingerprint-based verification.
Changes
AsyncClientSSL/TLS handling for the BearSSL pathSSL_CTX_PARAMSasync_config.hWhy
ESPHome needs maintained ESP8266 MQTT TLS support. The downstream MQTT client needs a TCP layer with TLS support. This is that support.
Verification
Verified downstream in ESPHome using local dependency overrides to this branch.