* add SAS validation logic for copySource

* add unit tests for cross account copy

* fix unit tests to use proper permissions
add file content validation

* ensure node-fetch is included in azurite install
create new key for devstoreaccount2

* fix test constant for devstoreaccount2 key

* switch to axios for http request

* remove devstoreaccount2 as default emulator account
add unit tests for public access blob/container

* add new method to StorageErrorFactory
switch to GET request with comp=metadata query parameter
update README to include new copy blob functionality
add more tests to cross-account blob copy

* add test for archived blobs

* update changelog to include upcoming release
update readme to fix docs for Abort blob copy
fix import of axios types in BlobHandler