Enable validation of gzip compressed jsonl files

[TobiasNx]

We validate larger jsonl files that usually come as gzip. Currently you need to unzip these jsonl file to use jsonschema validate.
So it would be a nice feature to enable the validation of these compressed files.

[jviotti]

While playing around with this, I detected a subtle issue where the JSON parser would over-read on the JSONL stream in vain, causing lots of extra silly I/O 🤦🏻 I have an adjacent fix that makes JSONL parser much much faster given that subtlety

[jviotti]

The other side annoyance is that I came to know that LibDeflate, which we use across various projects for GZIP stuff, does not support streaming decompression... We switched from ZLIB to LibDeflate at some point given the latter is MUCH faster. But given this, I guess we can pull both, and use them when each makes sense.

[jviotti]

The core libraries have support for JSONL GZIP decompression now. It will just be about exposing it on the CLI now. Hopefully on Monday

[jviotti]

I'm releasing a new version with this in a bit

[jviotti]

@TobiasNx Please try https://github.com/sourcemeta/jsonschema/releases/tag/v15.1.0. The validate command now transparently takes .jsonl.gz files, plus you should see JSONL parsing in general to be faster! Let me know how it goes!