`Microsoft.Quantum.Qir.Runtime.Tools.BuildFromQSharpDll` could be parametrized by `IQirExecutable` type

[swernli]

The Qir Runtime Tools expose a mechanism for generating an executable from a Q# DLL and appropriate headers+libraries folders:

qsharp-runtime/src/Qir/Tools/QirTools.cs

Lines 19 to 32 in b8159a1

	/// <summary>
	/// Creates QIR-based executables from a .NET DLL generated by the Q# compiler.
	/// </summary>
	/// <param name="qsharpDll">.NET DLL generated by the Q# compiler.</param>
	/// <param name="libraryDirectories">Directory where the libraries to link to are located.</param>
	/// <param name="includeDirectories">Directory where the headers needed for compilation are located.</param>
	/// <param name="executablesDirectory">Directory where the created executables are placed.</param>
	/// <param name="debug">Enable additional debugging checks at runtime.</param>
	public static async Task BuildFromQSharpDll(
	FileInfo qsharpDll,
	IList<DirectoryInfo> libraryDirectories,
	IList<DirectoryInfo> includeDirectories,
	DirectoryInfo executablesDirectory,
	bool debug)

However, the implementation specifically invokes new QirFullStateExecutable such that this only works for compiling against runtimes that use the fullstate simulator. If this method were instead generic across any type that implemented IQirExecutable then it would work well with the extensibility built into the tools to support arbitrary runtimes.