Refactor czi_hosted and server into backend directory, pull common code into backend/common, refactor tests (#2102)

* move local_server -> backend/server server-> backend/czi_hosted, pull common code into backend/common update imports, tests and make commands

backend/czi_hosted/eb/.ebextensions/enable_mod_deflate.config

@@ -0,0 +1,30 @@
+files:
+  "/etc/httpd/conf.d/enable_mod_deflate.conf":
+    mode: "000644"
+    owner: root
+    group: root
+    content: |
+      <IfModule mod_deflate.c>
+
+        AddOutputFilterByType DEFLATE text/plain
+        AddOutputFilterByType DEFLATE text/html
+        AddOutputFilterByType DEFLATE application/xhtml+xml
+        AddOutputFilterByType DEFLATE text/xml
+        AddOutputFilterByType DEFLATE application/xml
+        AddOutputFilterByType DEFLATE application/xml+rss
+        AddOutputFilterByType DEFLATE application/x-javascript
+        AddOutputFilterByType DEFLATE text/javascript
+        AddOutputFilterByType DEFLATE text/css
+        AddOutputFilterByType DEFLATE application/octet-stream
+
+        DeflateCompressionLevel 9
+
+        BrowserMatch ^Mozilla/4 gzip-only-text/html
+        BrowserMatch ^Mozilla/4\.0[678] no-gzip
+        BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
+
+        <IfModule mod_headers.c>
+          Header append Vary User-Agent env=!dont-vary
+        </IfModule>
+
+      </IfModule>

backend/czi_hosted/eb/.ebextensions/wsgi_app_group_global.config

@@ -0,0 +1,10 @@
+# Configure WSGI so that it will work with numpy, scanpy, etc, which all use the
+# Python SWIG, and therefore will deadlock on start.  For more information, see
+# https://modwsgi.readthedocs.io/en/develop/user-guides/application-issues.html#python-simplified-gil-state-api
+files:
+  "/etc/httpd/conf.d/wsgi_custom.conf":
+    mode: "000644"
+    owner: root
+    group: root
+    content: |
+      WSGIApplicationGroup %{GLOBAL}