Replace clipboard with arboard, which is actively maintained

[Tastaturtaste]

Adresses #606 and this request

Replace clipboard dependency with arboard.

Considerations

A look at crates.io shows that there are currently two major cross-platform clipboard crates to choose from:

1. arboard
2. copypasta

copypasta is maintained by the alacritty project, which gives some confidence in the future maintenance story. Using this crate as a drop-in replacement for clipboard works just from an API standpoint, but leads to failure of cargo test --features system_clipboard core_editor::clip_buffer::tests::reads_back on windows. This is due this bug and copypastas outdated version of clipboard-win. While this issue could be worked around, it does not instill much confidence in me that future issues will be resolved and dependencies kept up-to-date.

arboard is actively maintained by a corporation depending on it and has roughly three times the number of downloads of copypasta. While the API is not a drop-in replacement for clipboard, the required changes are minimal.

Dependencies

arboard does pull in a few dependencies, mostly depending on the target OS. Many of the dependencies, like log, thiserror, parking_lot (on linux) are already present in reedline's dependency graph anyway. In addition
However, as mentioned in #606, wayland support adds many dependencies to the list.

Number of unique dependencies for linux with system_clipboard enabled after cargo update:
current main: 53
arboard: 59
arboard + wayland: 99

Without having looked further into it copypasta also seems to pull in the majority of dependencies for wayland support. So I guess its mostly a wash in that department when comparing the alternatives.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ef7b96c) 49.32% compared to head (397a2e1) 49.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #705   +/-   ##
=======================================
  Coverage   49.32%   49.32%           
=======================================
  Files          46       46           
  Lines        7998     7998           
=======================================
  Hits         3945     3945           
  Misses       4053     4053           

Files	Coverage Δ
src/core_editor/clip_buffer.rs	100.00% <ø> (ø)

[fdncred]

Looks like pretty minimal changes, very nice! Thanks for this. I just had one further question above and then I think we could move forward.