Add workspace overview page (opensearch-project#19)

* feat: add workspace overview page

Signed-off-by: Lin Wang <wonglam@amazon.com>

* refactor: move paths to common constants

Signed-off-by: Lin Wang <wonglam@amazon.com>

* feat: add workspace overview item by custom nav in start phase

Signed-off-by: Lin Wang <wonglam@amazon.com>

* refactor: change to currentWorkspace$ in workspace client

Signed-off-by: Lin Wang <wonglam@amazon.com>

---------

Signed-off-by: Lin Wang <wonglam@amazon.com>

Author: wanglam

config/opensearch_dashboards.yml

@@ -290,3 +290,16 @@
 
 # Set the value to true to enable workspace feature
 # workspace.enabled: false
+
+opensearch.hosts: [https://localhost:9200]
+opensearch.ssl.verificationMode: none
+opensearch.username: kibanaserver
+opensearch.password: kibanaserver
+opensearch.requestHeadersWhitelist: [authorization, securitytenant]
+
+opensearch_security.multitenancy.enabled: true
+opensearch_security.multitenancy.tenants.preferred: [Private, Global]
+opensearch_security.readonly_mode.roles: [kibana_read_only]
+# Use this setting if you are running opensearch-dashboards without https
+opensearch_security.cookie.secure: false
+server.host: '0.0.0.0'