Performance related enhancement

• [ENHANCEMENT] #201 Make streamId a sql parameter of type SqlDbType.Char (cherrypicked from #197)

Bug fixes and improvements

No breaking changes. No API changes.

• Handles SetStreamMetadata idempotently #129
• Bug when reading stream backwards #120
• Improve MsSql append performance with millions of message on a single stream #117
• Allow overriding the way a SqlConnection is created #119

v0.8.1

This release is effectively v1.0.0-RC1

Main items

• the last position of a stream is track in the streams table and returned as part of the AppendResult
• breaking schema change with a migration script.
• Small perf improvement using a non-clustered index instead of a clustered one.