Add matchesPattern support

[Arithmomaniac]

Issues

This pull request fixes #1901.

Description

Adds support for the matchesPattern function introduced in OData v4. In addition to being added as a supported function to the raw parser, it is mapped in .NET to Regex.IsMatch(input, pattern, RegexOptions.ECMAScript).

The basic methodology was to look for any C# file in the repository that handled all of the string predicates (startswith, endswith, etc.) and added matchesPattern to that set. There was at least one legacy provider with no support for e.g. contains; that provider was unmodified.

As part of this work, the case-insensitivity logic had to be changed to account for matchesPattern being the first OData function whose canonical name is mixed-case.

Checklist

• [X] Test cases added
• [ ] Build and test with one-click build and test script passed
  • Almost of the tests passed locally
  • Some unit tests failed intermittently from the build script but worked in VS (different tests each time)
  • Astoria complained about Unable to cast COM object of type 'AstoriaUnitTests.Tests.JScriptEngine'...)

[pull-request-quantifier-deprecated[bot]]

This PR has 100 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Small
Size       : +90 -10
Percentile : 40%

Total files changed: 15

Change summary by file extension:
.cs : +90 -10

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