Allow custom pin schema for Dallas component

[ptr727]

Describe the problem you have/What new integration you would like

I would like to be able to use advanced pin configuration for the dallas component, including using ignore_strapping_warning and pullup.

Please describe your use case for this integration and alternatives you've tried:

I am using an ESP with the only external GPIO usable for Dallas DS18B20 being GPIO15.
GPIO15 is a bootstrap pin, and I get warnings about not using ignore_strapping_warning.
But the dallas component does not support advanced pin configuration.
I would also like to enable the internal pullup so that I don't need to use an external 4.7K resistor.

Additional context

Current config:

# Use expansion slot Pin6 GPIO15 for Dallas
# https://esphome.io/components/sensor/dallas.html
dallas:
  # TODO: How to add ignore_strapping_warning: true
  # WARNING GPIO15 is a strapping PIN and should only be used for I/O with care.
  - pin: GPIO15
    update_interval: 5s

Desired config e.g.:

# Use expansion slot Pin6 GPIO15 for Dallas
# https://esphome.io/components/sensor/dallas.html
dallas:
  - pin: 
       number: GPIO15
       pullup: true
       ignore_strapping_warning: true
    update_interval: 5s