feat(climate): add extraCommands to Midea RG70E/BGEF (1387)

[lucasjbx]

Summary

Adds an extraCommands block to the existing Midea RG70E/BGEF climate file (1387.json) with two additional IR codes captured from the physical remote via Broadlink RM3.

New commands

• led_toggle: toggles the AC display LEDs on/off. Useful to turn off the display at night without affecting the AC state.
• swing_step: advances the vertical louver one position per signal. Note: this remote does not send a fixed louver position — each press steps the louver by one increment, and the AC manages the position internally.

Usage example (Home Assistant)

These commands can be used with
emote.send_command:
\\yaml
service: remote.send_command
data:
command: led_toggle
device: ac
target:
entity_id: remote.your_broadlink_remote
\\

Notes

• The \extraCommands\ field is proposed as a standard extension for standalone IR codes that don't fit the climate entity state model (mode/fan/temp).
• Hardware tested: Midea MSM-12HRN1 unit with RG70E/BGEF remote.
• Related to issue IR Codes for ac Midea RG70E whit BGEF remote (Broadkink) #774 where the original climate codes for this remote were contributed.

Test plan

• Verify JSON is valid
• Verify \led_toggle\ code toggles display on physical unit
• Verify \swing_step\ code moves louver on physical unit