No IPv8 overlay statistics with statistics setting enabled

[qstokkink]

Describe the bug
The up/down/sent/received columns of the IPv8 debug info are all empty. The details tab is also empty.

To Reproduce
Steps to reproduce the behavior:

1. Enable statistics and restart Tribler.
2. Click on debug.
3. Click on IPv8 tab.
4. See lack of info in Overlays and Details tabs.

Expected behavior
Traffic info for all of the IPv8 overlays should be shown.

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Tribler's version: 7.13.0-GIT

Additional context
The cause for this behavior is that request_manager.post("ipv8/overlays/statistics", data={"enable": "True", "all": "True"}) is not invoked in debug_window.py (or anywhere else after startup) when Tribler's statistics setting is enabled.

[qstokkink]

[The following is a reconstruction of how the bug got introduced.]

The IPv8 statistics are correctly enabled on all loaded overlays (without a REST call) using the following code:

tribler/src/tribler/core/components/ipv8/ipv8_component.py

Lines 69 to 72 in 8d03b99

	if config.ipv8.statistics and not config.gui_test_mode:
	# Enable gathering IPv8 statistics
	for overlay in ipv8.overlays:
	ipv8.endpoint.enable_community_statistics(overlay.get_prefix(), True)

However, this call enables statistics on all loaded IPv8 overlays.

This was fine, in the past, when the call was made after all IPv8 + Tribler overlays were loaded.

However # 2, after the refactoring of Tribler's component loading, this call was moved to before any IPv8 or Tribler overlays were loaded. So, now, this code is enabling statistics for exactly 0 loaded overlays: it's doing nothing.