Use only non-defaults in toml config templates

[josecelano]

After implementing the configuration with Figment, it's possible to omit values if they are defaults. Therefore, we don't need to add all options in templates. We only need to add values that overwrite the default values.

For example, the new configuration file for development environment (share/default/config/tracker.development.sqlite3.toml) is:

[[udp_trackers]]
enabled = true

[[http_trackers]]
enabled = true

The only difference with the default values is UDP and HTTP services are enabled.

This makes it easier to maintain these templates and to see what changes have been made compared to the default values.

[codecov]

Codecov Report

Attention: Patch coverage is 96.59091% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 78.74%. Comparing base (3c78bba) to head (445bd53).

Files	Patch %	Lines
packages/configuration/src/v1/udp_tracker.rs	77.77%	2 Missing ⚠️
packages/configuration/src/v1/health_check_api.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #858      +/-   ##
===========================================
- Coverage    78.83%   78.74%   -0.10%     
===========================================
  Files          169      169              
  Lines         9341     9304      -37     
===========================================
- Hits          7364     7326      -38     
- Misses        1977     1978       +1     

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[josecelano]

ACK 445bd53