New tls fragment option

[Graveyard9988]

Please reconstruct "tls settings" via this source code:

kyochikuto/sing-box-plus@c4f79cf

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.