[Feature Request] Allow searching RDF database with URI

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**Graph Explorer Version (and Graph Database and Version used if applicable)**

**Is your feature request related to a problem? Please describe.**
If I know the exact URI for the resource I want to add to the canvas, I would like to be able to supply it and find that resource quickly.

**Describe the solution you'd like**
In the search panel, allow me to provide the URI for a specific resource and execute a simple subject query

```sparql
PREFIX rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#

SELECT ?subject ?predicate ?object
WHERE {
?subject ?predicate ?object .
FILTER (?subject = http://example.org/resource/123)
}
```

- Add URI option to "Predicate" drop down
- Apply "Class" dropdown selection to query, if "All" is not selected

**Considerations**

- Class filter may not make sense given a resource URI
- Could add a node that is not known in the schema, which can lead to side effects
- Both the "Class" dropdown and the "Predicate" dropdown are semantically incorrect as we would be searching on "subject" which might lead to confusion

**Additional context**
Originally proposed in PR https://github.com/aws/graph-explorer/pull/243#discussion_r1516927806