Add databake impl for LiteMap

[sffc]

See #4266

I thought we already had this impl but it seems to be missing!

@adamchalmers

[adamchalmers]

I am trying to figure out something similar for std::collections::HashMap -- how to keep a stable order so the unit tests actually pass reliably!

[robertbastian]

You can sort quoted tokens in the bake implementation. This won't be a meaningful sort, but it will give you stability.

[sffc]

Automatically generating utils/litemap/README.md 
error: failed to transform intralinks: failed to load standard library: Cannot find rust standard library in "/home/runner/.rustup/toolchains/1.73-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library"
[cargo-make] ERROR - Error while running duckscript: Source: Unknown Line: 33 - Error while executing command, exit code: 1

🤔

[robertbastian]

build.rs is one mechanism to run code generation.

Suggested change

	/// code generation or in a `build.rs` script.
	/// code generation.

[robertbastian]

explicit types?

Suggested change

	/// let mut litemap_alloc = LiteMap::new_vec();
	/// let mut litemap_alloc: LiteMap<usize, String, Vec<(usize, String>)> = LiteMap::new_vec();

[robertbastian]

Suggested change

	/// let litemap_str: LiteMap<usize, &str> = litemap_alloc.to_borrowed_values();
	/// let litemap_str: LiteMap<usize, &str, Vec<(usize, &str)>> = litemap_alloc.to_borrowed_values();

[robertbastian]

Suggested change

	/// let litemap_slice = litemap_str.as_sliced();
	/// let litemap_slice: LiteMap<usize, &str, &[(usize, &str)]> = litemap_str.as_sliced();

[robertbastian]

please don't assert the literal representation. use test_bake?

[sffc]

@robertbastian: or something like

format!("const FOO: ... = {}", bar.bake(...))