Organize DB Schema Migration Code and DB Init Checks (#842)

Create Schema Manager and propagate contexts into the DB calls downstream.
Add checks at controller startup and database init for correct schema version and schema migration dirty bit being set.

internal/errors/code_test.go

@@ -162,6 +162,16 @@ func TestCode_Both_String_Info(t *testing.T) {
 			c:    MissingTable,
 			want: MissingTable,
 		},
+		{
+			name: "MigrationIntegrity",
+			c:    MigrationIntegrity,
+			want: MigrationIntegrity,
+		},
+		{
+			name: "MigrationLock",
+			c:    MigrationLock,
+			want: MigrationLock,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {