Add Active Dev to Timing Class (#767)

* Add active_dev to Timing class

* update changelog

* Update codegen template

* fix lint error

* update metadata

* Update codegen

* fix error

* remove ACTIVE_DEVS_SUPPORTED_ATTRIBUTES

* raise errors for active devs not supported timing attribute

* address comments

* add unit test

* remove unused variable

* add more test

* address comments

* address comment

Author: charitylxy

CHANGELOG.md

@@ -30,6 +30,7 @@ All notable changes to this project will be documented in this file.
 * ### Resolved Issues
     * Fix PEP 660 builds by setting `build-system` to use `poetry-core`
     * [579: nidaqmx does not generate numbered virtual channel names correctly](https://github.com/ni/nidaqmx-python/issues/579)
+    * [692: Cannot set "ai_conv_rate" on NI DAQ 9209 due to missing active device modifier for timing attributes](https://github.com/ni/nidaqmx-python/issues/692)
 
 * ### Major Changes
     * Removed the `docs` extra and converted it to a Poetry dependency group.