Add Bulk Algorithm

[Andres-Salamanca]

• execution::bulk Implementation
  • Takes a sender, shape, and function, applying the function to each element from the sender.
  • Ensures compliance with the sender concept.
  • Handles error propagation using execution::set_error_t(std::exception_ptr).
  • If the function provided to bulk throws an exception, set_error_t(std::exception_ptr) is added to the completion signatures.
• Unit Tests
  • Verifies that bulk adheres to the sender concept.
  • Ensures correct completion signatures.
  • Includes tests for basic functionality and exception handling.