启用https 下 CPU100 卡死

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#### Which platform are you running AnyProxy

mac
#### The version of the AnyProxy

最新版本

#### Your expected behavior of AnyProxy

网页内请求多的话打开很慢，有些app也是
启动https的模式下，cpu占用100 ，大量请求堆积，大概也就是同时有几十条的样子，很久之后才能看到之前发出的请求，假死状态，处理完才能慢慢恢复，定位原因

SNIPrepareCert
1.43 s
loadSNI
100.00%
(/lib/httpsServerMgr.js 19)

SNIPrepareCert.async.series
1.42 s
anonymous
100.00%
(/lib/httpsServerMgr.js )

fetchRemoteResponse
777.49 ms
anonymous
99.83%
(/lib/requestHandler.js )

Promise
774.83 ms
Promise
99.66%
(/lib/requestHandler.js )

updateRecord
84.27 ms
co.then.then.then.then.then.catch.then.then
93.94%
(/lib/recorder.js )

占用较高的应该是/lib/httpsServerMgr.js： ctx = createSecureContext({
key: keyContent,
cert: crtContent
});

希望可以性能上得到优化，至少不让cpu占用那么高，导致假死状态。

#### The actual behavior of AnyProxy

#### The log of the error

Start with the profiling entries in lib/httpsServerMgr.js, especially SNIPrepareCert and createSecureContext, then compare the related work in lib/requestHandler.js and lib/recorder.js. Reproduce HTTPS mode with dozens of simultaneous requests and measure whether CPU usage and request backlog improve without leaving AnyProxy unresponsive.

Written by the indexing model from the issue text.