Add esql getting started notebook (#201)

* Add esql getting started notebook

* Enclose name with special characters in backticks

* Move to esql folder, remove subclient usage

* Remove subclient import

* Clear outdated output

* Add introduction, additional markdown information cells

* Add esql notebook to exempt list

* Add tech preview warning

* Add comment to clarify getpass usage

Author: leemthompo

bin/find-notebooks-to-test.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 # add any notebooks that are currently not testable to the exempt list
 EXEMPT_NOTEBOOKS=(
+    "notebooks/esql/esql-getting-started.ipynb"
     "notebooks/search/07-inference.ipynb"
     "notebooks/search/08-learning-to-rank.ipynb"
     "notebooks/langchain/langchain-vector-store.ipynb"