Add support for secure connection to hub

[ben221199]

At the moment, the SPV servers and LBRY Desktop only support plain text connections. However, for technical reasons, but also for security reasons, I think it should be a good practice if we add support for secure connections to the wallet server on port 50002. The reasons I see, are:

• Secure connections are (mostly) able to use SNI, which (in my case) can be used for some technical tricks
• Secure connections prevent others (e.g. the government) from spying what video's we have watched
• MITM attacks will be not possible or at least be harder to do.

lbry-desktop/ui/component/settingWalletServer/internal/inputRow.jsx

Line 51 in d14c914

placeholder={'50001'}

I think it is best to start making all the LBRY clients compatible with secure connections already, so that platforms which already provide secure servers can add them; after that, we can focus on upgrading the LBRY servers to a secure version too.

Note: I'm not advocating for dropping plaintext and 50001. I think we should keep that one too.

[ben221199]

My suggestion for UI change is:

• Add selector with options TCP (the default) and SSL/TLS.
• Keep the host field, but add support for IPv6.
• Make the port field optional. The default port (and placeholder) for TCP is 50001 and the default port (and placeholder) for SSL/TLS is 50002.

The other option is to make it just one field where you can enter in the form hostOrIP:port (TCP), tcp://hostOrIP:port (TCP), ssl://hostOrIP:port and tls://hostOrIP:port. Note that in this case, IPv6 address should definitely go between [ and ].