LUA : added bindings for extended ESC telem

[Pradeep-Carbonix]

Added lua bindings for the following :

singleton AP_ESC_Telem method get_input_duty boolean uint8_t 0 NUM_SERVO_CHANNELS uint8_t'Null
singleton AP_ESC_Telem method get_output_duty boolean uint8_t 0 NUM_SERVO_CHANNELS uint8_t'Null
singleton AP_ESC_Telem method get_flags boolean uint8_t 0 NUM_SERVO_CHANNELS uint32_t'Null

[loki077]

Minor change if needed I can implement it.

[loki077]

auto generated for reference
-- desc
---@param param1 integer
---@return integer|nil
function esc_telem:get_output_duty(param1) end

-- desc
---@param param1 integer
---@return integer|nil
function esc_telem:get_input_duty(param1) end

-- desc
---@param param1 integer
---@return uint32_t_ud|nil
function esc_telem:get_flags(param1) end

[loki077]

@Pradeep-Carbonix @robertlong13 can't see the Recommended change being implemented