feat: Add CalendarSelector component and install new dependencies.

node_modules/rxjs/dist/cjs/internal/operators/pairwise.js

@@ -0,0 +1,19 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.pairwise = void 0;
+var lift_1 = require("../util/lift");
+var OperatorSubscriber_1 = require("./OperatorSubscriber");
+function pairwise() {
+    return lift_1.operate(function (source, subscriber) {
+        var prev;
+        var hasPrev = false;
+        source.subscribe(OperatorSubscriber_1.createOperatorSubscriber(subscriber, function (value) {
+            var p = prev;
+            prev = value;
+            hasPrev && subscriber.next([p, value]);
+            hasPrev = true;
+        }));
+    });
+}
+exports.pairwise = pairwise;
+//# sourceMappingURL=pairwise.js.map