Add basic POC input device support and rotary encoder implementation as an example

[HaoboGu]

update: input device support will be separated to several PRs. This PR adds traits for input devices and input processors, implements those traits for rotary encoders(as an example)

[HaoboGu]

It seems that input devices requires lots of API changes.. It's a breaking change and current API isn't good for end users. So I'll revert the API changes and keep only traits and sample rotary encoder implementations.

To support the input device well, the whole architecture of the project needs to be upgraded. I'll do it in other PRs.

[github-actions]

PR build size

  text	   data	    bss	    dec	    hex	filename
122596	    116	  41308	 164020	  280b4	rmk-nrf52840

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
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  +0.4% +3.22Ki  [ = ]       0    .debug_info
  +1.2% +2.29Ki  [ = ]       0    .debug_loc
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  +0.7%    +744  [ = ]       0    .debug_ranges
  +0.4%    +420  +0.4%    +420    .text
  +0.3%    +385  [ = ]       0    .debug_line
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  +1.5%      +6  [ = ]       0    .defmt
  +0.0%      +4  +0.0%      +4    .rodata
 -11.3%      -7  [ = ]       0    [Unmapped]
  +0.5% +13.3Ki  +0.3%    +424    TOTAL

[github-actions]

PR build size

  text	   data	    bss	    dec	    hex	filename
122596	    116	  41308	 164020	  280b4	rmk-nrf52840

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.4% +4.93Ki  [ = ]       0    .debug_str
  +0.4% +3.21Ki  [ = ]       0    .debug_info
  +1.2% +2.29Ki  [ = ]       0    .debug_loc
  +0.9% +1.02Ki  [ = ]       0    .strtab
  +0.7%    +744  [ = ]       0    .debug_ranges
  +0.4%    +420  +0.4%    +420    .text
  +0.3%    +384  [ = ]       0    .debug_line
  +1.0%    +168  [ = ]       0    .debug_aranges
  +0.3%    +128  [ = ]       0    .symtab
  +1.5%      +6  [ = ]       0    .defmt
  +0.0%      +4  +0.0%      +4    .rodata
  -9.7%      -6  [ = ]       0    [Unmapped]
  +0.5% +13.3Ki  +0.3%    +424    TOTAL