Add Xspress3ExternalFileReference, Xspress3HDF5Plugin, and time series PVs

[jklynch]

This PR adds classes for generating resource and datum documents by way of "external file reference" signals, plus PVs for interacting with NDPluginTimeSeries PVs.

[mrakitin]

@jklynch, what if we exclude Python 3.7 from the test matrix and make Python 3.8 a minimum-supported version?

[prjemian]

I concur.

On Fri, Dec 9, 2022, 9:31 AM Maksim Rakitin @.***> wrote:

@jklynch https://github.com/jklynch, what if we exclude Python 3.7 from the test matrix and make Python 3.8 a minimum-supported version?

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[mrakitin]

@prjemian, thanks for your feedback! Just curious, is the nslsii package used at APS for anything?

[mrakitin]

Alternatively, the fix can be similar to https://github.com/bluesky/event-model/pull/233 for Python 3.7.

[prjemian]

The nsls2forge channel is included in the conda environment for the apstools package.

On Fri, Dec 9, 2022, 10:03 AM Maksim Rakitin @.***> wrote:

Alternatively, the fix can be similar to bluesky/event-model#233 https://github.com/bluesky/event-model/pull/233 for Python 3.7.

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[mrakitin]

Oh, we stopped maintaining the nsls2forge conda channel, and use conda-forge solely.