WIP: Updating FixedSizeStrings.jl

[Luapulu]

This is still a work in progress, but here are a few of the changes so far and proposed changes.

Changes so far

• Rename package and primary type to SizedStrings
  • This mirrors SizedArray from StaticArrays.jl and is more concise / easier to write than FixedSizeString.
• Significantly expand test coverage
  • I'll need to add codecov back in to get the exact coverage, but it's probably near 100% now.
• Replace REQUIRE file with Project.toml
• Removed implicit constructor SizedString("ferafver") for two reasons:
  1. Type instability
  2. Is consistent with StaticArrays.jl, as they also don't have an implicit constructor.

Planned Changes

• - Add docs
• - Add basic usage section to README
• - Add MaxSizeString (my personal biggest priority at the moment)
• - Use Github actions for CI (add badges back in)
• - Add convenience macro to make sized"some string" possible.
• - Write efficient comparison, map, filter functions, which make use of statically known size.

Let me know what you think :)

[Luapulu]

It might be worth naming the package and primary type StaticString as well.

[Luapulu]

I've been speaking with Scott Paul Johnson and I think I might rewrite all of this completely to use a tuple of UInt64 as the underlying storage. I also think this should probably live in a new package over at the JuliaString github org.