drivers: flash_mspi_nor: Refactor handling of commands

- Use standard operation codes and parameters from SFDP for handling
  the used flash commands (allow to override some of them through dts
  with the `read-command`, `write-command`, and `rx-dummy` properties)
- Use all available erase types as specified by SFDP
- Allow using all IO modes
- Add support for switching to 4-byte addressing mode
- Use common functions for reading and writing of status registers
  and for enabling write operations
- Switch IO mode (between the target one and Single IO) in a common
  function that performs transfers and do it only when required for
  a given command
- Make checking of JEDEC ID at initialization optional

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>