Support log over USB serial

[HaoboGu]

No description provided.

[github-actions]

PR build size

  text	   data	    bss	    dec	    hex	filename
121972	    116	  41308	 163396	  27e44	rmk-nrf52840

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.5% +2.83Ki  [ = ]       0    .debug_loc
  +0.1%    +862  [ = ]       0    .debug_info
  +0.5%    +753  [ = ]       0    .debug_line
  +0.3%    +304  [ = ]       0    .debug_ranges
  +0.0%    +267  [ = ]       0    .debug_str
  +0.2%     +40  [ = ]       0    .debug_aranges
  +0.0%     +16  [ = ]       0    .symtab
  +0.0%     +13  [ = ]       0    .strtab
  +9.1%      +6  [ = ]       0    [Unmapped]
  -0.1%      -6  [ = ]       0    .debug_abbrev
  -0.1%     -16  [ = ]       0    .debug_frame
  -0.2%     -32  -0.2%     -32    .rodata
  -0.2%    -168  -0.2%    -168    .text
  +0.2% +4.82Ki  -0.1%    -200    TOTAL

[github-actions]

PR build size

  text	   data	    bss	    dec	    hex	filename
123436	    116	  41308	 164860	  283fc	rmk-nrf52840

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +2.1% +4.04Ki  [ = ]       0    .debug_loc
  +0.1%    +902  [ = ]       0    .debug_info
  +0.6%    +775  [ = ]       0    .debug_line
  +0.5%    +520  [ = ]       0    .debug_ranges
  +0.0%    +231  [ = ]       0    .debug_str
  +0.2%     +32  [ = ]       0    .debug_aranges
  -0.1%      -6  [ = ]       0    .debug_abbrev
  -0.0%     -16  [ = ]       0    .symtab
  -0.0%     -22  [ = ]       0    .strtab
 -33.3%     -24  [ = ]       0    [Unmapped]
  -0.2%     -32  [ = ]       0    .debug_frame
  -0.2%     -32  -0.2%     -32    .rodata
  -0.2%    -168  -0.2%    -168    .text
  +0.2% +6.15Ki  -0.1%    -200    TOTAL