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Add GetAttribute and GetMatchingAttributes to MemberInfo, ParameterInfo and Type (#182)

* Add GetAttribute and GetMatchingAttributes to MemberInfo, ParameterInfo and Type

Closes #155.

- MemberInfoExtensions.GetAttribute<T>() and GetMatchingAttributes<T>()
  (with and without predicate), mirroring the existing non-inherited
  HasAttribute semantics rather than adding another *InHierarchy split.
- ParameterInfoExtensions.GetAttribute<T>() and GetMatchingAttributes<T>()
  with the same semantics.
- TypeMetaDataExtensions.GetAttribute<T>(), reusing the existing
  inherited GetMatchingAttributes<T>() behavior for consistency.
- New overloads use .ToArray()/.Cast<T>() instead of casting the
  GetCustomAttributes result to an array.
- Added focused specs for no match, single match, multiple matches,
  predicates and inheritance behavior.
- Updated README to document the new APIs.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Strengthen GetAttribute ordering specs

Assert that GetAttribute returns the first-applied attribute when multiple matching attributes are present, instead of only checking that a result exists.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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