feat(contrib/qxip/hash): add sha1, md5, base64, hmac

[lmangani]

This PR extends the contrib/qxip/hash package with additional functions for sha1, base64, md5, hmac

Note: The primary goal of this extension is powering flux native extensions dealing with auth token calculation etc. (ie: s3 client we're working on) without having to use or import additional go code.

• Updated Documentation
• Extended Test Converage

[sanderson]

Thanks @lmangani! A few minor suggestions on the docs, but this looks great.

[lmangani]

Thank you so much @sanderson! Next attempt in line is an S3 HTTP client for flux 100% made in flux 🤞

[lmangani]

@sanderson @gavincabbage I'm going into paranoid mode temporarily: building with the latest flux master causes the following error, which seems related to this PR. I'm not sure if this is just about how I'm building my binary, but I'd rather be safe than sorry:

panic: missing builtin values [sha1 b64 md5 hmac], extra builtin values []

goroutine 1 [running]:
github.com/influxdata/flux/runtime.FinalizeBuiltIns(...)
        /home/runner/go/pkg/mod/github.com/influxdata/flux@v0.192.0/runtime/global.go:97
github.com/influxdata/flux/fluxinit.FluxInit(...)
        /home/runner/go/pkg/mod/github.com/influxdata/flux@v0.192.0/fluxinit/init.go:23
github.com/influxdata/flux/fluxinit/static.init.0()
        /home/runner/go/pkg/mod/github.com/influxdata/flux@v0.192.0/fluxinit/static/static.go:10 +0x3f

Did I miss something in the new code? The previous hash contrib was working fine. Apologies in advance!

[sanderson]

@lmangani I think you need to regenerate the stdlib before you build.

> go generate ./stdlib ./libflux/go/libflux
> make generate

[lmangani]

I think this could be caused by me building using the master for the go library and a release (v0.192.0) as the library (or vice versa) which does not include yet the changes? As long as this is a build issue only on my side, all is well... Thanks @sanderson