feature request: add option to add files to SRC_URI

[fneddy]

Request

add two options to cargo bitbake to add specific files and all source files to the recipe SRC_URI variable.

example specific files:

    > cargo bitbake --add-source ./resources/config.toml  --add-source ./src/mod1/lib.rs
    # adds the repo to SRC_URI
    # adds additional two files to SRC_URI

example all files:

    > cargo bitbake --no-repo --add-all-source 
    # does not add the repo url to SRC_URI
    # adds all sources to the SRC_URI

Reasons

one may have multiple recipes in one repository (e.g. we have a repo for driver, one for tools and one for client apps). Currently cargo bitbake cannot create recipes for rust projects if they are not separated each into one repository.