Config overhaul: add version and namespace to the configuration

[josecelano]

Add version to the configuration. It will fail if the provided version is not supported.

version = "2"

It only supports the exact match '2'.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 77.36%. Comparing base (ddd73ca) to head (60c6876).

Files	Patch %	Lines
packages/configuration/src/lib.rs	67.85%	9 Missing :warning:
packages/configuration/src/v2/mod.rs	60.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #947 +/- ## =========================================== - Coverage 77.40% 77.36% -0.04% =========================================== Files 183 183 Lines 9675 9707 +32 =========================================== + Hits 7489 7510 +21 - Misses 2186 2197 +11 ```

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[josecelano]

ACK 60c68762b64b7b909987fc6002447af7c823adbe