Add MA0002.report_only_non_ordinal option

[meziantou]

What

Adds a new opt-in EditorConfig option MA0002.report_only_non_ordinal (default false, so existing behavior is unchanged).

MA0002 currently reports whenever a string-keyed collection or LINQ operation has an IEqualityComparer<string>/IComparer<string> overload but none is supplied — even when the default comparison is already ordinal (and therefore safe), e.g. new HashSet<string>(), new Dictionary<string,int>(), ToDictionary, ToImmutableDictionary.

When MA0002.report_only_non_ordinal = true, the analyzer suppresses diagnostics for a curated, exhaustive list of known-ordinal (equality-default) APIs while still reporting the genuinely risky culture-sensitive ordering APIs (SortedDictionary, SortedSet, SortedList, OrderBy, ThenBy, Order, ...), which default to Comparer<string>.Default (= StringComparer.CurrentCulture).

Known-ordinal set (suppressed when the option is on)

• Types (constructors / collection expressions): HashSet, Dictionary, ConcurrentDictionary, OrderedDictionary, ImmutableDictionary, ImmutableHashSet, FrozenDictionary, FrozenSet.
• Methods: LINQ equality methods (Distinct, DistinctBy, Contains, Except, ExceptBy, Intersect, IntersectBy, Union, UnionBy, GroupBy, GroupJoin, Join, LeftJoin, RightJoin, SequenceEqual, ToDictionary, ToHashSet, ToLookup, CountBy, AggregateBy) and immutable/frozen factories (Create, CreateBuilder, CreateRange, CreateRangeWithOverwrite, ToImmutableDictionary, ToImmutableHashSet, ToFrozenDictionary, ToFrozenSet).

The method names are scoped to their BCL container types (Enumerable, Queryable, ImmutableDictionary, ImmutableHashSet, FrozenDictionary, FrozenSet), so the Sorted* factories that share names like Create/CreateRange keep reporting. The list was verified by reflecting over the actual net10.0 assemblies rather than by guessing.

Because this is an allow-list (only suppress what is known-ordinal), the only failure mode is under-suppression — a culture-sensitive API can never be silently hidden.

Behavior change to note

Meziantou.Framework.Assertions.Assert was previously unconditionally excluded from MA0002. It is now folded into the option: reported by default and suppressed only when report_only_non_ordinal = true. This means Assert methods with a comparer overload start being reported by default.

Tests / docs

• Added analyzer tests for the option: suppressed known-ordinal cases (types, LINQ, collection expression, immutable factories, Assert) and still-reported ordering cases (SortedDictionary, OrderBy, Order, ImmutableSortedDictionary.Create).
• Updated docs/Rules/MA0002.md and regenerated docs/README.md.
• MA0002 tests pass on default Roslyn and on roslyn4.2 / roslyn4.14.