Config overhaul: split tracker mode

[josecelano]

Replace mode core config option with private and listed flags:

From:

[core]
mode = "public"
tracker_usage_statistics = true
inactive_peer_cleanup_interval = 600

To:

[core]
inactive_peer_cleanup_interval = 600
listed = false
private = false
tracker_usage_statistics = true

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.63158% with 17 lines in your changes missing coverage. Please review.

Project coverage is 77.47%. Comparing base (5f1fdbd) to head (b6b841d).

Files	Patch %	Lines
packages/configuration/src/v1/core.rs	81.48%	5 Missing :warning:
src/core/mod.rs	80.00%	4 Missing :warning:
src/lib.rs	0.00%	4 Missing :warning:
packages/test-helpers/src/configuration.rs	66.66%	3 Missing :warning:
src/app.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #934 +/- ## =========================================== + Coverage 77.29% 77.47% +0.18% =========================================== Files 183 183 Lines 9689 9666 -23 =========================================== Hits 7489 7489 + Misses 2200 2177 -23 ```

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[josecelano]

ACK b6b841d6fe244b8deaa62629791d100623a508ce