[RSDK-10493] Update sdk version to something recent

[penguinland]

I went with 0.70.0, released last week. This week's release has already needed a patch (and may or may not need more patches).

Everything compiles and the tests pass, but I am unsure how to actually try running it outside of production. but I kinda imagine that if it compiles, it probably still works.

The Camera interface lost its streaming capability, so I changed to use .Image() to get frames instead. We often seem to use jpegs, which confuses me because it's a lossy format. So, I'm using PNGs. The interface looks like it ought to be format-agnostic, but that does seem like something we need to try out (perhaps in an RC before a "real" release).

[penguinland]

This is the only line in this file I changed manually. All the rest of the changes (including line 3) came from running go mod tidy. 🤷

[bhaney]

Change to jpeg and use the convenience function rather than decoding the image yourself

[bhaney]

The size differences between jpeg and png can be gigantic- sometimes like 10x the size depending. Over grpc these image transfers slow our programs down considerably

[penguinland]

TIL, thanks!

Take another look. I also updated the makefile so it rebuilds the module every time the source code changes. Without that, you need to delete the old module before make will build it again.

[bhaney]

LGTM!
do click the "re-request review" button though in the future, as I have set up slack notifications to ping me when I have pending reviews to do