New service for registration process

[daniele-athome]

For deprecating the NumberValidator which is a mess. Will also bring in #1240.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@aee8052). Click here to learn what that means.
The diff coverage is 1.31%.

@@           Coverage Diff            @@
##             master   #1241   +/-   ##
========================================
  Coverage          ?   1.55%           
========================================
  Files             ?     355           
  Lines             ?   25536           
  Branches          ?    3324           
========================================
  Hits              ?     398           
  Misses            ?   25086           
  Partials          ?      52

Impacted Files	Coverage Δ
.../main/java/org/kontalk/provider/UsersProvider.java	0% <ø> (ø)
...main/java/org/kontalk/util/InternalTrustStore.java	0% <ø> (ø)
...java/org/kontalk/service/XMPPConnectionHelper.java	0% <ø> (ø)
...n/java/org/kontalk/crypto/PersonalKeyExporter.java	0% <ø> (ø)
.../main/java/org/kontalk/client/NumberValidator.java	5.25% <ø> (ø)
.../java/org/kontalk/authenticator/Authenticator.java	0% <ø> (ø)
...registration/event/VerificationRequestedEvent.java	0% <0%> (ø)
.../service/registration/event/VerificationError.java	0% <0%> (ø)
...alk/service/registration/event/LoginTestEvent.java	0% <0%> (ø)
...lk/service/registration/event/ThrottlingError.java	0% <0%> (ø)
... and 25 more

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