Support for case insensitive filtering for string

[ishit-parikh-hs]

Added a boolean param in Filter to support case-insensitive filter for strings and operators - StartsWith, EndsWith, Contains and Doesnotcontain

[yogen-darji-hs]

support for this #15

[ishit-parikh-hs]

Property name changed to Pascal case

[linmasaki]

By the way, I found some references that indicated the case sensitivity depends on the database provider. For example, SQLite and PostgreSQL are case-sensitive by default, others like SQL Server and MySQL are case-insensitive. On the other hand, Use string.ToLower might cause a performance issue.

Overriding case sensitivity in a query via EF.Functions.Collate (or by calling string.ToLower) can have a very significant impact on your application's performance.

References:

1. toODataString returns an invalid string when using case insensitive search
2. Entity Framework Core - Contains is case sensitive or case insensitive
3. Collations and Case Sensitivity