Split into crates, remove codecrafters leftovers

[sinon]

Why?

When working in codecrafters you were required to build a lexer, parser and eval that would output to stdout. Tests for previous sections were required to keep passing even when they were made obsolete by subsequent code. Since I am no longer using codecrafters there is a lot of code than can be deleted.

What?

Split into crates
Removed code that isn't needed by the main interpreter/run command

[codecov-commenter]

Codecov Report

❌ Patch coverage is 67.74194% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.2%. Comparing base (3c87e80) to head (2afa2d5).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/loxide/src/interpreter.rs	33.3%	10 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/lexer/src/lib.rs	100.0% <ø> (ø)
crates/loxide/src/builtins.rs	88.8% <ø> (ø)
crates/loxide/src/main.rs	100.0% <100.0%> (ø)
crates/loxide/src/value.rs	85.7% <ø> (ø)
crates/parser/src/lib.rs	84.7% <ø> (ø)
crates/loxide/src/interpreter.rs	73.1% <33.3%> (ø)