sdk / extension version strategy

[ChuckHend]

Managing compatibility between the SDKs and the Extension is brittle. There is currently not a defined relationship between the SDKs version and the extension version. They should all follow semver, and we can use semver to define the compatibility between them. e.g. Python SDK 1.1.0 must be compatible with Extension version 1.0.0. Some things that should be implemented:

• changes to the Extension trigger tests on the SDKs
• any SDK changes should be run on the latest version of the Extension
• SDKs should have some sort of compatibility check with the environment they execute against and give feedback to user. e.g. running python 0.0.1 against Extension 2.0.0 should raise something useful to the user.

[ChuckHend]

when we reach 1.0 in the extension, all client will also release 1.0

then, we maintain a map of the required version of client to extension. clients will contain validation checks within their library.