API consistency for System.Memory APIs (argument names) (#28160)

API consistency for System.Memory APIs (argument names) (#28160)

* AsBytes and Cast: Change arg name source -> span

* CopyTo: Change arg name array/sequence -> source

* Several APIs: Change arg name arraySegment -> segment

* Several APIs: Change arg name readOnlyMemory -> memory

* BinaryPrimitives and Utf8Formatter: Change arg name buffer -> source or destination

* Base64: Change arg name consumed/written -> bytesConsumed/bytesWritten

* Utf8Parser: Change arg name text -> source

* TryGetOwnedMemory: Change arg name ownedMemory -> owner, index -> start

* BuffersExtensions.Write: Change arg name bufferWriter -> writer

* Span Compare APIs: Change arg name first -> span, second/value -> other

* ROSequence.TryGet & BuffersExtensions: Change arg name data -> memory, sequence -> source

* Fix mistake in BinaryPrimitives Writer APIs, source -> destination.

* BufferExtensions.Write: Change arg name source -> span

* SequencePosition.Equals: Change arg name position -> other

* BufferExtensions ToArray: Change arg name source -> sequence

* Rename leftover arraySegment to segment in MemoryMarshal.TryGetArray

* BufferExtensions.Write: Change arg name span -> value

* Contains, StartsWith, EndsWith: Change arg name other -> value

Signed-off-by: dotnet-bot-corefx-mirror <dotnet-bot@microsoft.com>