Snap package for RTL-SDR tools

Hi,

I made a snap [1] package for the RTL-SDR tools. The package has "strict" confinement, which allows installing it on any supported distro.

I tested it on Ubuntu 21.10 (on amd64) and Ubuntu Core on a Raspberry Pi (my main use case for the packaging is to be able to run rtl_tcp on the latter).

Would you consider merging this to the repo and possibly publishing snap packages on the Snap Store as part of the regular release process?

Cheers, -Alberto

[1] https://snapcraft.io/docs