install buf via npm

[sethvincent]

closes #105
closes #33

This installs buf from npm and moves the buf command usage out of ci jobs and into a package.json script that's included in build:all.

[gmaclennan]

Need to remove this https://github.com/digidem/mapeo-schema/blob/master/scripts/generate.js#L24

Otherwise looks good.

[achou11]

Need to remove this https://github.com/digidem/mapeo-schema/blob/master/scripts/generate.js#L24

@gmaclennan don't we need to keep that but update it to npx buf ...? Otherwise there's nothing that actually does the generation, from what I can tell

either update it or extract that command to the build:protobuf npm script

[gmaclennan]

@gmaclennan don't we need to keep that but update it to npx buf ...? Otherwise there's nothing that actually does the generation, from what I can tell

oops yeah I had assumed the build:protobuf script did that, but now see that it just outputs the version. @sethvincent maybe make the npm script do the buf build? I moved it to execSync in the generate.js script under misguided assumptions.

[sethvincent]

Thanks! Updated to fix the things mentioned.

[achou11]

@sethvincent now that you updated the npm script I think you can remove the line in the generate.js script

Other than that, lgtm!