custom mempool server fixes [has DB changes]

[basantagoswami]

Fixes #1741 and a few other things

1. Added a toggle called enable SSL which is auto-detected from the protocol prefix (http:// vs https://)
2. User can override the toggle
3. Fixes the UI of the delete custom server popup in dark mode
4. Added a MempoolUrlParser util to parse and normalize mempool server URLs
5. Added a status indicator to the default and custom servers to check if the server is online
6. Tested this setup with .onion links too, if Orbot is running, then those it works without any additional config
7. Made the errors displayed to users easier to understand

Note: This PR has DB changes to add an enableSSL field to mempool table

[basantagoswami]

• This PR adds the default value for the newly added enableSsl column to be true, which is fine because even users with custom mempool servers couldn't have added any non https server previously
• Updated the icons in the Advanced Option screen during the on-boarding flow to match the ones in settings. Also added the custom mempool server option there

• Updated the translation files that had English values for the keys with AI generated translations. Added 9 more localization to other hardcoded strings in the mempool feature