Graph Fluent API: Add support for DSE 6.8

Description

Update serialization and traversal to query generation logic for DSE 6.8+.

Environment

None
Fixed

Assignee

Unassigned

Reporter

Joao Reis

Labels

None

PM Priority

None

Fix versions

External issue ID

None

Doc Impact

None

Reviewer

None

Pull Request

None

Epic Link

Sprint

C# P-NEXT

Pull Requests

None

Size

None

Priority

Major
Configure