Add support for graph async API
What's Changed
* async api by swilly22 in https://github.com/FalkorDB/falkordb-py/pull/11
* add docs for async by swilly22 in https://github.com/FalkorDB/falkordb-py/pull/13
* async index ops by swilly22 in https://github.com/FalkorDB/falkordb-py/pull/14
* async index ops by swilly22 in https://github.com/FalkorDB/falkordb-py/pull/15
**Full Changelog**: https://github.com/FalkorDB/falkordb-py/compare/v1.0.1...v1.0.2