…#2540)
When reviewing the `<ResolveLibraryProjectImports/>` task, I noticed
a few things we could improve:
 1. We are using `GetResourceData()` to get the entire contents of a
    file as a `byte[]` and then writing to disk.
 2. We are writing temporary zip files to disk, reading them to
    extract, then deleting them.
The first thing I did was take advantage of the `GetResourceStream()`
method, so we could just do `stream.CopyTo(file)`.  This prevents us
from allocating big `byte[]` the size of each file.
Next, I took advantage of `ZipArchive.Open(stream)` and
`GetResourceStream()` to avoid the need for creating temporary zip
files.  We can unzip directly from the `Stream` in memory.
~~ Results ~~
When timing these changes, I used the Xamarin.Forms integration
project in this repo:
	Before
	1. 1793 ms  ResolveLibraryProjectImports               1 calls
	2. 1780 ms  ResolveLibraryProjectImports               1 calls
	3. 1770 ms  ResolveLibraryProjectImports               1 calls
	After
	1. 1750 ms  ResolveLibraryProjectImports               1 calls
	2. 1740 ms  ResolveLibraryProjectImports               1 calls
	3. 1702 ms  ResolveLibraryProjectImports               1 calls
I would say the improvements here are around 50ms.