Linq methods

[jannesiera]

• We have added support for additional result operators. (.First, .Contains, .All, .Except, .Interect, .Union, .Any)
• We are throwing a NotImplementedException when trying to process a result operator that is currently not implemented.
• We have added additional tests.
• We have expanded the README to reflect the current status of the LINQ implementation.
• The following tests are NOT passing:
  • Except_SubQuery
  • Average
  • Cast
  • Distinct
  • Except_Compare_Objects
  • GroupJoin
  • Intersect
  • Intersect_With_Count
  • Join
  • Last
  • Reverse
  • SameVariableChained
  • StringTrim

We have currently paused development on these. Hopefully someone continues the work :).

[coronabytes]

@jannesiera can you please fixup or delete these non working tests?

For TRIM with the missing params, can't you just just rewrite the query to LTRIM(RTRIM(x, p), p) ? performance hit should be negligible