feat: enable encryption of the HTTP Request body output

[loicmathieu]

Fixes kestra-io/kestra#3032

Can be tested with the following flow:

id: hello-http
namespace: company.team
tasks:
  - id: hello
    type: io.kestra.plugin.fs.http.Request
    uri: https://api.chucknorris.io/jokes/random
    encryptBody: true
  - id: log
    type: io.kestra.core.tasks.log.Log
    message: "{{json(outputs.hello.encryptedBody).value}}"

Note that, due to limitation of our serialization system, when encrypted we had to use a different output than when not encrypted.