feat: define HashMap of hint groups along with hint strings

[dorimedini-starkware]

Define a HashMap of hint groups along with hint strings

Description

In the starkware sequencer, it will be useful to have access to a complete list of hint strings implemented in the VM.
The current situation is: each hint string is defined as a separate const, with no container aggregating all of them.

This PR introduces a macro to define + collect hint constants - should be no change except additional lazy_static HashMaps of hint strings (hint name => hint string).

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.
  • CHANGELOG has been updated.

[dorimedini-starkware]

Note: to refactor hint_codes.rs, I did the following:

1. Turned off auto-formatting in my editor
2. find: pub const ([A-Z_0-9a-z]+): &str = ?\n? *(r#)?"(([^;]|\n)*)"#?;\n\n?
3. replace: ($1, indoc! {r#"$3"#}),\n
4. Fox consts X: &str = Y annotated with #[cfg(feature = "test_utils")], I changed the (X, indoc! {Y}) to be (X, indoc! {Y}, "test_utils").
5. the cairo0_hints module got the same treatment, except I had to move all the (X, indoc! {Y}) pairs to the top