Bugs/fix 2487 allow contains whitespaces

[JKamsker]

Fixes #2487 and contains a minor perf improvement

[pictos]

@JKamsker we do have a failing build, can you verify the reason?

[JKamsker]

@JKamsker we do have a failing build, can you verify the reason?

Debug builds just fine, release doesnt.
Because:

LiteDB/LiteDB/Utils/Constants.cs

Lines 7 to 10 in 610e530

	#if DEBUG
	[assembly: InternalsVisibleTo("LiteDB.Tests")]
	[assembly: InternalsVisibleTo("ConsoleApp1")]
	#endif

And CreateEngine in

LiteDB/LiteDB.Tests/Issues/Issue2487_Tests.cs

Line 22 in fad6af3

using var engine = new ConnectionString(":memory:").CreateEngine();

Which is internal

LiteDB/LiteDB/Client/Structures/ConnectionString.cs

Line 110 in 610e530

internal ILiteEngine CreateEngine()

@pictos Do you think its safe to remove the #if DEBUG in Constants ? Otherwise we cant test release builds. I Have no idea whats the benefit of InternalsVisibleTo when you cant use it half of the time.