Update include_gif macro so it can accept any kind of image as input.

[agrojean-ledger]

JIRA ISSUE : https://ledgerhq.atlassian.net/jira/software/c/projects/EMBSDK/boards/818?selectedIssue=EMBSDK-52

• Accept different file formats (GIF, PNG, JPG...). Still need to be careful with compressed file formats as they introduce some visual artifacts that can alter the final result (better to stick with uncompressed like GIF, PNG).
• No need to have gray scale images as input, color images can be used. Conversion is automatic :
  • To 1-bit depth (1 color) black and white for Nano devices,
  • Up to 4-bit depth (16 colors) gray scale for Stax / Flex.

⚠️ Care should still be taken regarding the size of the images as they are not resized automatically by the macro to each device's screen requirements.

• Run tests of rust boilerplate to check if the include_gif output is 100% unchanged.