Add ZHA blueprint for Namron 4512793 Simplify remote

[willmakenoise]

Adds a ZHA blueprint for the Namron AS 4512793 "Simplify" wireless remote — a 3-channel battery-powered button remote (6 buttons: 3 rocker channels x up/down), each with press/hold/hold (released).

This corresponds to the ZHA quirk in zigpy/zha-device-handlers#5315 (not yet merged), which is required for the command values this blueprint matches on to be emitted by ZHA.

Blueprint Checklist

• You viewed the README and conformed to the naming conventions
• You ordered the actions as stated in the README action order
• All filenames are lowercase and uses '-' for spaces and not '_' while using {service-name}-{switch-name-or-type}.yaml format
• Images are png
• Image backgrounds are transparent and is cropped to the device boundaries
• Images has a maximum width of 800px and maximum height of 500px
• There are no missing buttons or actions
• Your integration/service is running on the latest version
• You have tested your blueprints and made sure each button and action works

Zigbee2MQTT

• (older devices) You have ensured legacy is off/false for the device in the Z2M devices Settings (specific) page and that your actions matches those with legacy off?

N/A — this is a ZHA device, not Zigbee2MQTT.

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