Use more spans in `System.Reflection.Metadata` et. al. (#76574)

Use more spans in `System.Reflection.Metadata` et. al. (#76574)

* Use Unsafe.As in ImmutableByteArrayInterop.

Code quality increases.

* Optimize methods in the BlobUtilities class.

* Include more information in exceptions thrown from catch blocks.

* Use spans in BlobContentId, avoiding ImmutableByteArrayInterop.

* Use spans in BlobWriter, reducing pinning and ImmutableArrayInterop.

* Use spans in BlobBuilder, reducing pinning and ImmutableArrayInterop.

* Remove NoInlining from the throw helpers.

It prevents the JIT from looking into the method's body, realizing it's a throw helper, and doing what's best (such as considering it cold).

* Inline `BlobUtilities.Read(Immutable)?Bytes`.

* Avoid a length check introduced by the use of `BinaryPrimitives`.

* Remove `DisallowNull` from `ImmutableArrayInterop.DangerousCreateFromUnderlyingArray`.

* Remove an early bail-out if the buffer was empty.

* Stop using value tuples.

* Fix tests and expose writing a span to BlobWriter.

* Fix stack overflows.

* Shorten BlobUtilities methods that write integers.

* Optimize some methods in `MemoryBlock`.