Enable LINQ ThenBy operator after OrderBy

[khdang]

Description

• Enable LINQ ThenBy operator after OrderBy to use composite indexing
• Refactor LINQ tests

E.g

LINQ with ThenBy

query.OrderBy(f => f.FamilyId).ThenBy(f => f.Int).ThenByDescending(f => f.IsRegistered)

SQL

SELECT VALUE root 
FROM root 
ORDER BY root["FamilyId"] ASC, root["Int"] ASC, root["IsRegistered"] DESC

Type of change

• New feature (non-breaking change which adds functionality)

Closing issues

[kirankumarkolli]

@khdang can you please take a look at the test failures?

[khdang]

@khdang can you please take a look at the test failures?

I've updated the tests.