feat: add warning for mixed operators without parentheses

[ivanauth]

When writing permission expressions like viewer - blocked & editor, it's easy to assume arithmetic-style precedence. But SpiceDB's actual precedence (exclusion binds loosest, then intersection, then union) can lead to unexpected behavior.

This adds a lint warning that flags mixed operators at the same scope, nudging users to add parentheses and make their intent explicit.

Example:

permission view = viewer - blocked & editor  // warns
permission view = (viewer - blocked) & editor  // ok
permission view = viewer + editor + blocked  // ok (same operator)

The warning can be suppressed with:

// spicedb-ignore-warning: mixed-operators-without-parentheses
permission view = viewer - blocked & editor

Fixes authzed/zed#598

[codecov]

Codecov Report

❌ Patch coverage is 29.36508% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.05%. Comparing base (21d76e0) to head (6d64184).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/namespace/metadata.go	0.00%	47 Missing ⚠️
pkg/schemadsl/compiler/translator.go	63.83%	11 Missing and 6 partials ⚠️
pkg/development/warningdefs.go	0.00%	15 Missing ⚠️
pkg/namespace/builder.go	0.00%	7 Missing ⚠️
pkg/development/warnings.go	0.00%	3 Missing ⚠️

❌ Your project check has failed because the head coverage (59.05%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (21d76e0) and HEAD (6d64184). Click for more details.

HEAD has 26 uploads less than BASE

Flag	BASE (21d76e0)	HEAD (6d64184)
	49	23

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2786       +/-   ##
===========================================
- Coverage   77.70%   59.05%   -18.65%     
===========================================
  Files         472      425       -47     
  Lines       49707    44857     -4850     
===========================================
- Hits        38620    26485    -12135     
- Misses       8234    15809     +7575     
+ Partials     2853     2563      -290     

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[josephschorr]

@ivanauth this won't actually work in all cases, because expressions can cross multiple lines. Instead, this should likely be done by marking the expression during compilation with a piece of metadata, and having the warnings generator read that metadata

[ivanauth]

Switched from source-scanning to compile-time metadata detection per review feedback. Added NodeTypeParenthesizedExpression wrapper in parser to track explicit grouping, then detect mixed operators during AST translation. Also fixed edge case where top-level parentheses like (a + b - c) would skip the warning.