Changing global parameters should reload all cache

[Swoorup]

It appears the type provider cache's generated members for each sql statement which is great but fails to regenerate members and uses a stale cache, when any of the global parameters is updated, namely the XCtor.

To Reproduce:

• Disable XCtor on the global Database type.
• Write a SQL query using the CreateCommand.
• Enable the XCtor
• Observe that it still thinks it should use a connection string.

[kerams]

The simplest solution would be to make the global parameters part of the cache key:

FSharp.Data.Npgsql/src/DesignTime/NpgsqlConnectionProvider.fs

Lines 30 to 40 in d4825fa

	let m = ProvidedMethod("CreateCommand", [], typeof<obj>, isStatic = true)
	m.DefineStaticParameters(staticParams, (fun methodName args ->
	methodsCache.GetOrAdd(
	methodName,
	lazy
	let sqlStatement, resultType, singleRow, allParametersOptional, typename, xctor, prepare =
	if not globalXCtor
	then
	args.[0] :?> _ , args.[1] :?> _, args.[2] :?> _, args.[3] :?> _, args.[4] :?> _, args.[5] :?> _, args.[6] :?> _
	else
	args.[0] :?> _ , args.[1] :?> _, args.[2] :?> _, args.[3] :?> _, args.[4] :?> _, true, args.[5] :?> _

A lot of parameter changes without having a mechanism to flush the cache will lead to memory bloat, but I don't think it's something we need to really worry about.