Refactor locking to use an ILockService provider

[dviry]

Motivation

Implements #178

Passes WOPI-Validation tests for Locks:

Test group: Locks
  Pass: LockLengthValidation
  Pass: LockFormatValidation
  Pass: SuccessfulLockSequence
  Pass: LockMismatchAfterUnlockAndRelockRequest
  Pass: DoubleLockSequence
  Pass: UnlockUnlockedFile
  Pass: LockMismatchOnLockRequest
  Pass: LockMismatchOnUnlockRequest
  Pass: LockMismatchOnRefreshLockRequest
  Pass: LockMismatchOnUnlockAndRelockRequest
  Pass: LockMismatchOnPutFileRequest
  Pass: LockFileWithInvalidAccessToken
  Pass: UnlockFileWithInvalidAccessToken

[codecov]

Codecov Report

Attention: Patch coverage is 33.81295% with 92 lines in your changes missing coverage. Please review.

Project coverage is 23.26%. Comparing base (f83208d) to head (f95d6f1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/WopiHost.Core/Controllers/FilesController.cs	27.05%	47 Missing and 15 partials ⚠️
...c/WopiHost.Core/Controllers/EcosystemController.cs	0.00%	10 Missing ⚠️
...Core/Security/Authentication/AccessTokenHandler.cs	0.00%	6 Missing ⚠️
src/WopiHost.Core/WopiCoreBuilderExtensions.cs	0.00%	4 Missing ⚠️
...Security/Authorization/WopiAuthorizationHandler.cs	0.00%	2 Missing ⚠️
...WopiHost.FileSystemProvider/WopiSecurityHandler.cs	0.00%	2 Missing ⚠️
src/WopiHost.Abstractions/IWopiLockProvider.cs	75.00%	1 Missing ⚠️
.../WopiHost.Core/Controllers/ContainersController.cs	0.00%	1 Missing ⚠️
...ost.Core/Controllers/WopiBootstrapperController.cs	0.00%	1 Missing ⚠️
src/WopiHost.Core/FileExtensions.cs	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   17.78%   23.26%   +5.48%     
==========================================
  Files          47       48       +1     
  Lines         973      993      +20     
  Branches       90      102      +12     
==========================================
+ Hits          173      231      +58     
+ Misses        786      733      -53     
- Partials       14       29      +15     

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[petrsvihlik]

will be reviewed tonight...as well as the other one

[petrsvihlik]

all lgtm