DS18B20 Add onewire_bus UART Backend

[Narukara]

ESP-BSP Pull Request checklist

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• Version of modified component bumped
• CI passing

Change description

This PR updates the ds18b20_read example to support the new UART backend introduced in onewire_bus 1.1.0, while keeping RMT support.

It adds menuconfig options to select the 1-Wire backend (RMT/UART) and updates the example/CI build variants accordingly so backend-specific builds are selected based on SoC capability.

No functional changes were made to the ds18b20 driver itself.

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Note

Low Risk
Low risk: changes are limited to the ds18b20_read example, its build variants, and dependency metadata; no driver logic is modified. Main risk is CI/build matrix behavior changing due to new backend- and SoC-capability gating.

Overview
Adds selectable 1-Wire backend support to the ds18b20_read example, allowing either RMT or UART to be chosen via new menuconfig options (main/Kconfig.projbuild) and wiring this into ds18b20_example_main.c.

Updates CI/build-test rules to build backend-specific variants and skip them when the target SoC lacks the required peripheral support, and adds example sdkconfig.bsp.rmt / sdkconfig.bsp.uart presets.

Bumps the ds18b20 component version to 0.3.1 and updates its onewire_bus dependency to ^1.1.0; documentation/changelog are updated accordingly.

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[suda-morris]

LGTM

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