add Ian Chechin to AUTHORS and CONTRIBUTORS

Ian Chechinrequested to merge
Deln0r/sqlite:chore/add-author-ian-chechin into master

Following the invitation in !115 (merged) review thread:

If you and/or your company want to be listed in the AUTHORS and/or CONTRIBUTORS files please send another MR for that.

This MR adds my name to both files, inserted at the alphabetical position between Harald Albrecht and Jaap Aarts. Email matches the commit author identity used in !114 (merged), !115 (merged), !116 (merged).

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