Feat/web （Patchset 4） (#460)

support basic functions in frontend
1. create/del network
2. inspect network running status

easytier-web/frontend-lib/src/modules/utils.ts

@@ -0,0 +1,15 @@
+import { IPv4, IPv6 } from 'ip-num/IPNumber'
+import { Ipv4Addr, Ipv6Addr } from '../types/network'
+
+export function num2ipv4(ip: Ipv4Addr) {
+    return IPv4.fromNumber(ip.addr)
+}
+
+export function num2ipv6(ip: Ipv6Addr) {
+    return IPv6.fromBigInt(
+        (BigInt(ip.part1) << BigInt(96))
+        + (BigInt(ip.part2) << BigInt(64))
+        + (BigInt(ip.part3) << BigInt(32))
+        + BigInt(ip.part4),
+    )
+}