[2.1.0] Central queue connections

[stancl]

Resolves #110

TODO:

• Should the key be tenancy or central?
• Documentation

[codecov]

Codecov Report

Merging #181 into 2.x will increase coverage by 0.38%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x     #181      +/-   ##
============================================
+ Coverage     89.28%   89.66%   +0.38%     
- Complexity      306      332      +26     
============================================
  Files            51       52       +1     
  Lines           905      997      +92     
============================================
+ Hits            808      894      +86     
- Misses           97      103       +6

Impacted Files	Coverage Δ	Complexity Δ
.../TenancyBootstrappers/QueueTenancyBootstrapper.php	100% <100%> (ø)	7 <5> (+1)	⬆️
src/TenantManager.php	97.84% <0%> (-0.19%)	59% <0%> (+23%)
src/Jobs/QueuedTenantDatabaseSeeder.php	42.85% <0%> (ø)	2% <0%> (?)

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