SwiftNIO 2.49.0

SemVer Minor

• Mark EventLoop.syncShutdownGracefully and EventLoopGroup.syncShutdownGracefully noasync (#2381)
• Add a pooled recv buffer allocator (#2362)
• NIOAsyncWriter: Provide a fast path for single element writes (#2365)
• Provide OnLoopSendable: Sendable containers that bind a value to a specific EventLoop (#2370)
• Add support for UDP_SEGMENT (#2372)
• Add support for UDP_GRO (#2385)

SemVer Patch

• Pool buffers for ivecs and storage refs in the event loop. (#2358, patch credit to @ser-0xff)
• Fix memory binding. (#2376, patch credit to @ser-0xff)
• Fix an upcoming compiler warning on implicit raw pointer casts. (#2377, patch credit to @atrick)
• Buffer pool for message headers and addresses. (#2378, patch credit to @ser-0xff)
• Remove unused array (#2361)
• Make PooledBuffer safer. (#2363)
• Fix swift-nio iOS builds. (#2369)
• Don't retain a task when all we want is a time (#2373)
• Make our time types transparent (#2374)
• Allow UDP GRO tests to fail in some circumstances (#2387)

Other Changes

• TCP channel throughput benchmark. (#2367, patch credit to @ser-0xff)
• Add UDP performance tests (#2360)
• Clarify on EL semantics (#2366)
• Add availability requirements to TCPThroughputBenchmark (#2368)
• Not Holding OnToRunClosure() test updates (#2375)
• Remove redundant availability guards (#2379)
• Lower the max segment count in tests (#2382)
• Rebuild the channel when retrying testWriteBufferAtGSOSegmentCountLimit (#2383)
• Rework the NIOAsyncSequenceProducer tests to rely less on timings (#2386)
• Work around the SwiftPM layout change. (#2389)
• Always populate utsname (#2391)