[PORT] Add initial code owners to packages

[tomlm]

Port this change from botbuilder-dotnet/master branch:
microsoft/botbuilder-dotnet#3746

Add in initial set of code owners to make Pull Requests and related operations more clear.

[R9]

[cleemullins]

This is part of the debt/backlog work we'll take on in R10.

[cleemullins]

This would shold mirror, as closley as possible the CODEOWNERS file we've got in C#. That file is found here:
https://github.com/microsoft/botbuilder-dotnet/blob/master/.github/CODEOWNERS

[tracyboehrer]

Same owners? From: Chris Mullins <notifications@github.com> Sent: Thursday, April 16, 2020 11:30 AM To: microsoft/botbuilder-python <botbuilder-python@noreply.github.com> Cc: Tracy Boehrer <Tracy.Boehrer@microsoft.com>; Assign <assign@noreply.github.com> Subject: Re: [microsoft/botbuilder-python] [PORT] Add initial code owners to packages (#953) This would shold mirror, as closley as possible the CODEOWNERS file we've got in C#. That file is found here: https://github.com/microsoft/botbuilder-dotnet/blob/master/.github/CODEOWNERS<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.202132.xyz%2Fmicrosoft%2Fbotbuilder-dotnet%2Fblob%2Fmaster%2F.github%2FCODEOWNERS&data=02%7C01%7Ctracy.boehrer%40microsoft.com%7C7db7459cb6eb4f639ffd08d7e2236681%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637226513979836431&sdata=mJHPF%2FzUAJFXSxj4CmfGKYNniS%2FSNoncU24BoJKEVxc%3D&reserved=0> — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.202132.xyz%2Fmicrosoft%2Fbotbuilder-python%2Fissues%2F953%23issuecomment-614758375&data=02%7C01%7Ctracy.boehrer%40microsoft.com%7C7db7459cb6eb4f639ffd08d7e2236681%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637226513979846420&sdata=kDsmDKhF5HSlkLfCebVuGQdlIRP4pGdIIsYghVuH1js%3D&reserved=0>, or unsubscribe<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.202132.xyz%2Fnotifications%2Funsubscribe-auth%2FAAH2HBXEIHNAJLFR4PEXHPTRM4XAHANCNFSM4MI6DA7A&data=02%7C01%7Ctracy.boehrer%40microsoft.com%7C7db7459cb6eb4f639ffd08d7e2236681%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637226513979846420&sdata=%2FAY1EKsxkj6wC6pBhHN1LF6sGs3x3LADeKxZRBpDn7g%3D&reserved=0>.