[2.x] Refactor Config\Repository dependencies to use Contract

[drbyte]

Fixes #156

[codecov]

Codecov Report

Merging #157 into 2.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x     #157   +/-   ##
=========================================
  Coverage     89.37%   89.37%           
  Complexity      292      292           
=========================================
  Files            50       50           
  Lines           866      866           
=========================================
  Hits            774      774           
  Misses           92       92

Impacted Files	Coverage Δ	Complexity Δ
src/Features/TenantConfig.php	100% <ø> (ø)	9 <0> (ø)	⬇️
.../TenancyBootstrappers/RedisTenancyBootstrapper.php	100% <ø> (ø)	6 <0> (ø)	⬇️
...rc/TenantDatabaseManagers/MySQLDatabaseManager.php	100% <ø> (ø)	4 <0> (ø)	⬇️
...nantDatabaseManagers/PostgreSQLDatabaseManager.php	100% <ø> (ø)	4 <0> (ø)	⬇️

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