[2.x] Migrate fresh

[stancl]

Alternative implementation of #128

I think delegating the migration logic to tenants:migrate is better than extending the MigrateCommand, when it's not really a migrate command. Kind of a composition over inheritance thing. Also this means that we don't have to register the command in the service provider, as it does not depend on Migrator.

Also used $tenant->getDatabaseConnection() instead of hard-coded 'tenant', since tenants can use a different DB connection. And used the tenants namespace instead of tenancy.

ping @drbyte

TODO:

• Tests
• Documentation [2.x] Migrate fresh #148

[codecov]

Codecov Report

Merging #148 into 2.x will increase coverage by 0.46%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x     #148      +/-   ##
============================================
+ Coverage     89.06%   89.53%   +0.46%     
- Complexity      271      274       +3     
============================================
  Files            46       47       +1     
  Lines           805      822      +17     
============================================
+ Hits            717      736      +19     
+ Misses           88       86       -2

Impacted Files	Coverage Δ	Complexity Δ
src/TenancyServiceProvider.php	94.87% <ø> (ø)	4 <0> (ø)	⬇️
src/Commands/Migrate.php	94.11% <ø> (ø)	4 <0> (ø)	⬇️
src/Commands/MigrateFresh.php	100% <100%> (ø)	3 <3> (?)
src/TenantManager.php	100% <0%> (+2.17%)	32% <0%> (ø)	⬇️

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