refactor: update charm sync api

packages/charm-sync/src/__tests__/utils.spec.luau

@@ -0,0 +1,25 @@
+local Charm = require("../../Charm")
+local suite = require("../../../../test/suite")
+local utils = require("../utils")
+
+local atom = Charm.atom
+local test = suite.test
+
+test("should flatten atoms", function()
+	local getF, setF = Charm.signal(0)
+	local input = {
+		a = atom(0),
+		b = { c = atom(0) },
+		d = { e = { f = utils.signalToAtom(getF, setF) } },
+	}
+	local result = utils.flattenState(input)
+
+	assert(result.a == input.a, "should flatten the first level")
+	assert(result["b/c"] == input.b.c, "should flatten the second level")
+	assert(result["d/e/f"] == input.d.e.f, "should flatten the third level")
+
+	assert(result.b == nil, "should remove the original nested tables")
+	assert(result.d == nil, "should remove the original nested tables")
+end)
+
+return {}