GitLab

- implement attribute finding methods for SSE endpoints that currently
  support it

- missing functionality is awaiting upsteam changes

- implement function to extract keyid from request content or path

- implement function to call XNAT rest api and get project for a given keyid

Update dependency com.google.code.gson:gson to v2.8.9

See merge request !10

Update dependency mysql:mysql-connector-java to v8.0.27

See merge request !9

Update dependency com.google.code.gson:gson to v2.8.8

See merge request !8

Update dependency mysql:mysql-connector-java to v8.0.26

See merge request !7

Update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.8.1

See merge request indie-sleep-demo/snet-xnat-context-handler!6

Update dependency org.apache.maven.plugins:maven-assembly-plugin to v3.3.0

See merge request indie-sleep-demo/snet-xnat-context-handler!5

Update dependency mysql:mysql-connector-java to v8.0.25

See merge request indie-sleep-demo/snet-xnat-context-handler!3

Update dependency com.google.code.gson:gson to v2.8.7

See merge request indie-sleep-demo/snet-xnat-context-handler!2

Configure Renovate

See merge request indie-sleep-demo/snet-xnat-context-handler!1

* Adds a completely untested draft of what our custom xnat attribute
finder might look like
* Adds an example `query.xml` for retrieving the project associated with
a given keyid using XNAT's search endpoint like this:
```
curl -X POST -u admin:admin -s http://xnat:8080/xnat/data/search/?format=json -F "file=@query.xml" | jq .
```