J. Nick Koston 94ea150082 [helpers] Add heap allocation warnings and deprecate unused std::string APIs
Add @warning comments to all format_hex_pretty() overloads in helpers.h
pointing to the buffer-based format_hex_pretty_to() alternatives.

Deprecate with ESPDEPRECATED (removal 2026.9.0):
- EthernetComponent::get_eth_mac_address_pretty()
  -> use get_eth_mac_address_pretty_into_buffer()
- AsyncWebServerRequest::url()
  -> use url_to()

Neither deprecated method has internal callers.
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Description
ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.
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