refactor sender types definition

[wokron]

No description provided.

[Copilot]

Pull request overview

Refactors the public sender type definitions to reduce duplication by introducing shared base templates, and adjusts ranged when_any precondition handling.

Changes:

• Introduced OpSenderBase, ParallelSenderBase, and RangedParallelSenderBase and converted multiple sender classes to type aliases over these bases.
• Added an empty-range runtime check for when_any(Range&&) (ranged overload) in sender_operations.hpp.
• Renamed ranged operation state aliases in op_states.hpp for consistency (When*RangeOperationState → RangedWhen*OperationState).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
include/condy/senders.hpp	Refactors sender type definitions into shared base templates; converts several sender types to aliases.
include/condy/sender_operations.hpp	Adds empty-range validation for ranged when_any.
include/condy/op_states.hpp	Renames ranged operation state aliases and updates inheritance accordingly.

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