Update Error messages for failed downloads

[hasezoey]

Currently the Errors for failed downloads are not very helpful, like:

mongodb-memory-server/packages/mongodb-memory-server-core/src/util/MongoBinaryDownload.ts

Line 434 in 2d46099

reject(new Error('Status Code isnt 200!'));

it only says that the code is not 200, but not which code it actually was.
there are also some other errors thrown for failed downloaded which should also be handled better