ReadRow, to query only required columns

Merge pull request #7 from sendinblue/CC-3396

CC-3396 - Add support for ReadRow, to query only required columns

Fix write and read concurrency issue

Merge pull request #6 from ced42/CC-2661

CC-2661 - fix error: concurrent map read and map write

ReadLast event + Read a single column family

Merge pull request #1 from sendinblue/issue/merge-upstream

ReadLast & Read events from one family

Access-Layer gets Generally Available

v1.0.0

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