Implement `isUri` (same as `isIri`)

[joka921]

The isUri function is equivalent to the alreaady implemented isIri function. Fixes #1447

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.45%. Comparing base (0539e10) to head (8dec4b8). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1463 +/- ## ========================================== + Coverage 89.43% 89.45% +0.01% ========================================== Files 346 346 Lines 25258 25258 Branches 3370 3370 ========================================== + Hits 22590 22595 +5 + Misses 1506 1503 -3 + Partials 1162 1160 -2 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud