feat(core): add state mutability computation from world param

[glihm]

Description

On the last update, where self and ContractState were removed from the #[dojo::interface], we lost the ability of generating an ABI with the correct state mutability of the systems, everything was a view.

However, for client side code generation from ABI, we do want the systems to be identified as external in the ABI.

Also, now the use of self is definitely removed from dojo::interface and dojo::contract. Only the world parameter must be used.

1. If the world parameter is present, the world is injected in the function + the state mutability is deduced from ref world: IWorldDispatcher or world: @IWorldDispatcher.
2. If no world is injected, it defaults to view.

Related issue

Closes #1995.

Tests

• Yes
• No, because they aren't needed
• No, because I need help

Added to documentation?

• README.md
• Dojo Book << must be done.
• Inline documentation in the code.

Checklist

• I've formatted my code (scripts/prettier.sh, scripts/rust_fmt.sh, scripts/cairo_fmt.sh)
• I've linted my code (scripts/clippy.sh, scripts/docs.sh)
• I've commented my code
• I've requested a review after addressing the comments

[codecov]

Codecov Report

Attention: Patch coverage is 95.54140% with 7 lines in your changes missing coverage. Please review.

Project coverage is 68.32%. Comparing base (78c88e5) to head (ff3e154).

❗ Current head ff3e154 differs from pull request most recent head f055f75

Please upload reports for the commit f055f75 to get more accurate results.

Files	Patch %	Lines
crates/dojo-lang/src/syntax/world_param.rs	88.52%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2049      +/-   ##
==========================================
- Coverage   68.35%   68.32%   -0.03%     
==========================================
  Files         323      326       +3     
  Lines       40450    40426      -24     
==========================================
- Hits        27648    27620      -28     
- Misses      12802    12806       +4     

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[lambda-0x]

few doc related suggestions, aside from that LGTM!