Adds Alembic migration for DB/Tables conversion to utf8mb4

MySql defaults to `utf8` and case insensitive collation so migrate these to case sensitive and `utf8mb4`

Closes #21

Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>
1 job for master in 31 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed test #24099

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