feat(db-engine): Add support for Apache Solr (#12403)

* [db engine] Add support for Apache Solr

* Fixing typo

docs/src/pages/docs/Connecting to Databases/index.mdx

@@ -30,6 +30,7 @@ A list of some of the recommended packages.
 |[Apache Impala](/docs/databases/impala)|```pip install impala```|```impala://{hostname}:{port}/{database}```|
 |[Apache Kylin](/docs/databases/kylin)|```pip install kylinpy```|```kylin://<username>:<password>@<hostname>:<port>/<project>?<param1>=<value1>&<param2>=<value2>```|
 |[Apache Pinot](/docs/databases/pinot)|```pip install pinotdb```|```pinot+http://CONTROLLER:5436/ query?server=http://CONTROLLER:5983/```|
+|[Apache Solr](/docs/databases/solr)|```pip install sqlalchemy-solr```|```solr://{username}:{password}@{hostname}:{port}/{server_path}/{collection}```
 |[Apache Spark SQL](/docs/databases/spark)|```pip install pyhive```|```hive://hive@{hostname}:{port}/{database}```
 |[Azure MS SQL](/docs/databases/sqlserver)||```mssql+pymssql://UserName@presetSQL:TestPassword@presetSQL.database.windows.net:1433/TestSchema```
 |[Big Query](/docs/databases/bigquery)|```pip install pybigquery```|```bigquery://{project_id}```|

docs/src/pages/docs/Connecting to Databases/solr.mdx

@@ -0,0 +1,18 @@
+---
+name: Apache Solr
+menu: Connecting to Databases
+route: /docs/databases/solr
+index: 10
+version: 1
+---
+
+## Apache Solr
+
+The [sqlalchemy-solr](https://pypi.org/project/sqlalchemy-solr/) library provides a
+Python / SQLAlchemy interface to Apache Solr.
+
+The connection string for Solr looks like this:
+
+```
+solr://{username}:{password}@{host}:{port}/{server_path}/{collection}[/?use_ssl=true|false]
+```

docs/src/pages/docs/Connecting to Databases/spark-sql.mdx

@@ -2,7 +2,7 @@
 name: Apache Spark SQL
 menu: Connecting to Databases
 route: /docs/databases/spark-sql
-index: 10
+index: 11
 version: 1
 ---