Add Sislog sms provider

[Mh-Asmi]

This pull request makes the following changes:

Test checklist:

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Fixes ushahidi/platform# .

Ping @ushahidi/platform

[linear]

USH-1529 Connect SMS data source (sislog) to Moz deployment

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Ohanzee\Database\Exception: Incorrect string value: '\xE7e' for column ushahidi.messages.message at row 1 [ INSERT INTO... Ushahidi\DataSource\Sislog\SislogController@han... View Issue

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