New tls fragment option

[Graveyard9988]

Please reconstruct "tls settings" via this source code:

https://github.com/kyochikuto/sing-box-plus/commit/c4f79cfb3b6044d09561545c8d5c643adbcbb0a2

Reason of fork developer: I updated the way Fragment works in Singbox core as follows:

• Only clientHello packets are fragmented, not the whole handshake
• The SNI part will definitely be fragmented regardless of the interval value you set for the size parameter

• Health check for the reasonableness of intervals.

  With mentioned changes, the functionality of singbox will match the tlsHello fragment method in Xray core.