[feature] support fe https request

[gnehil]

Proposed changes

Issue Number: #124

Problem Summary:

1. Support FE https request.
   You can set the following options to enable https:

   • Set doris.enable.https to true
   • Set doris.https.key-store-path to the file path of a valid ssl certificate
   • Set doris.https.key-store-type to the certificate type, the default value is JKS
   • Set doris.https.key-store-password to certificate file password
     Note:
     • Since BE does not currently support https, stream load through https only supports redirection by FE (setting the doris.sink.auto-redirect option to true, which is the default value)

2. Refactor RestService

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[JNSimba]

LGTM