[wip] Esri mapserver connections api

[elpaso]

UNFINISHED for comments only

Implementation of the new connections API for web services (OGC and ESRI), the base abstract class is designed to handle a generic web service (OGC or ESRI) connection for both rasters and features, providers will need to implement their specific parts.

This initial implementation only handles AMS and AFS and it provides a partial implementation limited to connections storage and retrieval.

[nyalldawson]

Looking good to me! One thing is that we'll need to merge the afs and ams connection classes, since a single server mixes and matches these two services in a free-form way. But I'm happy to tackle this part of it!

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[stale]

While we hate to see this happen, this PR has been automatically closed because it has not had any activity in the last 21 days. If this pull request should be reconsidered, please follow the guidelines in the previous comment and reopen this pull request. Or, if you have any further questions, just ask! We love to help, and if there's anything the QGIS project can do to help push this PR forward please let us know how we can assist.

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The QGIS project highly values your contribution and would love to see this work merged! Unfortunately this PR has not had any activity in the last 14 days and is being automatically marked as "stale". If you think this pull request should be merged, please check

• that all unit tests are passing

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  In case you should have any uncertainty, please leave a comment and we will be happy to help you proceed with this pull request.
  If there is no further activity on this pull request, it will be closed in a week.

[stale]

While we hate to see this happen, this PR has been automatically closed because it has not had any activity in the last 21 days. If this pull request should be reconsidered, please follow the guidelines in the previous comment and reopen this pull request. Or, if you have any further questions, just ask! We love to help, and if there's anything the QGIS project can do to help push this PR forward please let us know how we can assist.