[Perf] High Allocator DoWriteIfNeeded

[benaadams]

Drill down on Issue #288
Measurements post PR #287

Item 5 on highest allocators in plaintext test

Allocations (2003 requests)

Writes alloc on List.Add not GCHandle.Alloc for clarity

Bytes (2003 requests)

Writes alloc on List.Add not GCHandle.Alloc for clarity

[benaadams]

Have PR for this coming

[benaadams]

Resolved by #315 "Lockless socket output, lower allocs"

[benaadams]

Resolved by #363 Resuse writes, initalize queues