baking_lib: sleep until forged block timestamp before injection

What

In the baking_lib, with the option --minimal-timestamp, blocks are injected as soon as possible. In sandboxed block have a block delay of 1s. Using bake for --minimal-timestamp could lead to block injected in the future. This MR force the block to be injected after their timestamp is reached.

This MR fixes #7185

Why

How

Manually testing the MR

Run a sandboxed node and client on master, activate_alpha, and then bake blocks with --minimal-timestamp with:

while true; do octez-client bake for --minimal-timestamp; done 

After some blocks, a block will be produce with a timestamp more than 5s in the future and the node validator will reject it with Block in the future error.

Try the same commands with this branch and check that the bake for command can run indefinitely.

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
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• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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