drivers/w1: add 1-wire shell

This commit implements shell support for 1-Wire.
Commands for bus-reset, bit-, byte-, and block- communication,
as well as search and configuration are implemented.

- write_byte, and write_block perform a reset before,
in case the option "-r" is passed.
- using read_io_options() function to parse the reset option,
as this allows to easily add further options in the future.
- configuration type can be specified either as number or as name.

Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>