Add a console command for removing expired tokens

[HypeMC]

Closes #4

[codecov-io]

Codecov Report

Merging #53 into master will increase coverage by 0.63%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #53      +/-   ##
============================================
+ Coverage     89.95%   90.59%   +0.63%     
- Complexity      267      280      +13     
============================================
  Files            42       43       +1     
  Lines           916      978      +62     
============================================
+ Hits            824      886      +62     
  Misses           92       92

Impacted Files	Coverage Δ	Complexity Δ
Command/ClearExpiredTokensCommand.php	100% <100%> (ø)	9 <9> (?)
Manager/Doctrine/AccessTokenManager.php	100% <100%> (ø)	5 <1> (+1)	⬆️
Manager/InMemory/AccessTokenManager.php	100% <100%> (ø)	4 <1> (+1)	⬆️
Manager/Doctrine/RefreshTokenManager.php	100% <100%> (ø)	5 <1> (+1)	⬆️
Manager/InMemory/RefreshTokenManager.php	100% <100%> (ø)	4 <1> (+1)	⬆️

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