"Some key-value pair configuration items are used to control
outgoing TCP fragments, which can deceive the censorship
system in some cases, such as bypassing SNI blacklists."
-"packets": Supports two slicing methods. "1-3" is TCP's stream
slicing, which is applied to the client's 1st to 3rd time writing data.
"tlshello" is the TLS handshake packet slice.
-"length": Fragmented packet length (byte)
-"interval": Fragmentation interval (ms)
https://xtls.github.io/config/outbounds/freedom.html#outboundconfigurationobject
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