* Abstract MongoTransaction to make the usage more comfortable

* Tweak the method name

* Ignore .vscode

* Add MongoDBTest

* New DotNetCore.CAP.MongoDB

* Use MongoDB

* Initialize MongoDB

* GetPublishedMessageAsync

* GetPublishedMessagesOfNeedRetry

* Get received message

* Change published state

* Chang received state

* Store received message

* MongoDBStorageTransaction

* Implement CapPublisher

* Fix CAP.BuilderTest

* Implement ICollectProcessor

* Configure MongoDBOptions

* Test MongoDBHelper

* Remove useless code

* GetMonitoringApi

* Test MongoDbStorage

* Test MongoDBStorageConnection

* Test MongoDBStorageConnection

* Add sample for MongoDB

* Tweak CapPublisher

* Wati interval

* Tweak Mongo extension

* Publish without mongo session

* Publish rollback

* Publish without session & subscribe msg

* Tweak rabbitmq config

* .gitignore

* Implement & test HourlyFailedJobs

* Rename MongoDBUtil

* Rename MongoDBUtilTest

* Tweak pipeline

* Implement HourlyJobs

* Remove redundant code

* Implement Messages

* Implement MessagesCount

* Fix non-standard StatusName

* To local time

* Tweak two properties name

* Tweak two methods name

* Supplement xml comments

* Fix wrong names

* Replace FORMAT

* Replace offset

* Use sqlserver 2008

* Remove blank lines

* Tweak UseSqlServer2008

# Conflicts:
#	build/version.props
#	samples/Sample.Kafka.MySql/Sample.Kafka.MySql.csproj
#	samples/Sample.RabbitMQ.MySql/AppDbContext.cs
#	samples/Sample.RabbitMQ.MySql/Program.cs
#	samples/Sample.RabbitMQ.MySql/Sample.RabbitMQ.MySql.csproj
#	src/DotNetCore.CAP/LoggerExtensions.cs

* fixed message enqueue exception in v2.2

* add log to samples

* Improved log output.  #114

* add default timeout configuration for kafka client.

* fixed retry processor bugs.

* Fixed kafka producer exception log without logging when publish message.

* update version num to 2.2.2

* rename configuration options FailedCallback to FailedThresholdCallback

* rename files name.

* remove unused files.

* modify the error comments.

* update samples.

* add logs.