feat: configurable field-accessor prefixes (SchemaFactory::stripFieldPrefixes)

[oojacoboo]

What

Adds SchemaFactory::stripFieldPrefixes(getters:, setters:) to configure the method-name prefixes GraphQLite strips to derive field names and matches when resolving property accessors:

$factory->stripFieldPrefixes(getters: ['get', 'is', 'has'], setters: ['set']);

This generalizes the hasser support proposed in #766 (thanks @adynemo). Adding has to the getters exposes hassers such as hasStock() via #[SourceField], #[Field], etc. The defaults (getters: ['get', 'is'], setters: ['set']) preserve the historical behavior, so the feature is opt-in.

Exact-case boundary rule

Prefixes are now stripped only when they sit on a real camelCase boundary (the character right after the prefix is uppercase). So isEnabled() becomes enabled and hasHKey() becomes hKey, but ordinary words such as issue(), hashKey(), gettext(), settings() and setup() are left untouched.

This replaces the previous length-only check (str_starts_with($m, 'is') && strlen($m) > 2), which mis-stripped any word starting with a prefix (issue() gave a field named sue, settings() gave tings). See the discussion in #766.

Breaking change

The exact-case rule changes field-name derivation for method names where a prefix is followed by a lowercase letter. The change is always in the "less stripping" direction and only affects names that were almost certainly being mis-stripped:

method	old field	new field
getName()	name	name (unchanged)
isEnabled()	enabled	enabled (unchanged)
issue()	sue	issue
gettext()	text	gettext
settings()	tings	settings

Migration: if a #[Field]/#[SourceField] method relied on the old behavior, set an explicit name with #[Field(name:)] or the source field's name. Documented in CHANGELOG under 8.4.0.

Design notes

• A small immutable FieldAccessorPrefixes value object owns the two prefix lists and the boundary rule, so NamingStrategy (naming) and PropertyAccessor (lookup) share one source of truth.
• NamingStrategyInterface is unchanged; prefixes are a construction-time detail of the default NamingStrategy.
• All new parameters are optional and defaulted (PropertyAccessor::findGetter/findSetter, the FieldsBuilder and NamingStrategy constructors), so existing callers are unaffected.
• Runtime PropertyAccessor::getValue/setValue intentionally keep the default prefixes: they back property #[Field] reads/writes against an existing property, whereas the hasser/#[SourceField] path resolves the method at build time and invokes it through SourceMethodResolver.

Tests

• Unit: FieldAccessorPrefixesTest (strip logic, hasSetterPrefix, edge cases), plus additions to NamingStrategyTest and PropertyAccessorTest.
• End-to-end (StripFieldPrefixesTest): a #[SourceField] hasser (getter side) and a custom-prefixed setter input field (setter side) each resolve and hydrate only when the prefix is configured.
• Full suite green, PHPStan level 8 clean, phpcs clean.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.79%. Comparing base (53f9d49) to head (9d941af).
⚠️ Report is 171 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #827      +/-   ##
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- Coverage     95.72%   91.79%   -3.94%     
- Complexity     1773     2101     +328     
============================================
  Files           154      203      +49     
  Lines          4586     5630    +1044     
============================================
+ Hits           4390     5168     +778     
- Misses          196      462     +266     

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