Implement ToS acceptance via CLI

[mmmarcos]

The CLI-based workflow described in #7847 needs to be able to work on a server requesting ToS acceptance (introduced in #6439).

Some ideas on how to achieve this (to be discussed):

• CLI "auto-accept-tos" option added to each command
• CLI "auto-accept-tos" mode via configuration or envvar

In either cases, the workflow would be something like:

1. CLI runs command X
2. Server respond "ToS acceptance required"
3. CLI sends ToS acceptance
4. CLI retry command X

Notes:

• Only implementing CLI commands for getting/accept ToS is not sufficient because it should be possible to automate the process (thus the auto accept option or mode).
• Also, exposing commands for getting/accept ToS is not strictly required either because this could be transparently implemented as a behavior of the CLI (enabled via envvar) instead of commands available for the user. This could be done later.

TODOs

• [x] #8773
• [ ] #8778
• [ ] #8782
• [ ] #8787