User Defined Timestamp APIs

[muthukrishnan24]

Adds bindings for User Defined Timestamp APIs

[muthukrishnan24]

@linxGnu

[linxGnu]

I am sorry for late reply due to my job. I will take a look and feedback soon.

thank you for the contribution

[muthukrishnan24]

Made the requested changes. Please check @linxGnu

[linxGnu]

@muthukrishnan24

Almost LGTM, just 2 request changes above.

And could you please add more tests. It's important to ensure ops with timestamp works. AFAIK, timestamp feature is currently under experiment?

[muthukrishnan24]

AFAIK, timestamp feature is currently under experiment?

taken from here

It's still experimental in the sense that:

   - it's currently supported in a subset of RocksDB features: Get, Put, WriteBatch (with only Put and Delete), Delete, Iterator, basic Garbage collection not necessarily the most efficient implementation), and
   - new APIs and/or options may be added, and
   - (less likely) existing user-defined timestamp APIs and/or options are also subject to change in future RocksDB releases

[linxGnu]

@muthukrishnan24 thank you for the info.

could you please fix my comments above and especially: adding tests

[muthukrishnan24]

Fixed your comments, Added test cases. Please check @linxGnu

[linxGnu]

Its absolutely great job @muthukrishnan24
I will merge your PR and prepare for next release.