[DOC] Add filter by drawing boundary on Maps

[VijayanB]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request and all versions that are affected.
Maps will support a feature to add filters by drawing object like rectangle, circle and polygon, as local and global filter.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/dashboards-maps#213

[VijayanB]

Please tag v2.7.0. Thanks