Add in-memory IR parser

[wongey]

This PR introduces the function from_bytes that creates a memory buffer for in-memory IR, parses the IR string content, and returns a Module. A simple test is included to read QIR files from the test/data folder, parse it to a string, and send it to from_bytes without throwing an error.

[sethrj]

Looks like this accidentally contains #30; could you please fix and then I'll continue reviewing?

[wongey]

@sethrj -- please proceed

[sethrj]

Still seems to have the other branch?

[wongey]

@sethrj The rebase command above only showed me commits that were not in your branch or PR and those were the ones I picked...you should only see new commits since after the debug session.

[sethrj]

Thanks!