feat(server): add endpoint to search spans in a trace

[schoren]

This PR adds an endpoint that allows searching spans within a trace.

The query is transmitted via post body to avoid possible issues with URL length if the query is a bit large.

The plain text implementation is a bit naive, it just does a string.contains over a json encoded version of each span, both the query and the json lowercased for improved matching.
While this is a pretty terrible implementation, it's easy and it works. In the future if needed we could implement a more complex solution, like Bleve, ElasticSearch, etc, but at this time this seems like a good enough approach.

Examples:

Search by query language

POST http://localhost:11633/api/tests/{{testID}}/run/{{runID}}/search-spans

{"query": "span[tracetest.span.name = \"Delete Report from cache\"]"}

Search by text

POST http://localhost:11633/api/tests/{{testID}}/run/{{runID}}/search-spans

{"query": "Delete Report from cache"}

Loom video

https://www.loom.com/share/e2912a4fde554a85a8dfb043fca983fc

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Name	Status	Preview	Updated (UTC)
tracetest	✅ Ready (Inspect)	Visit Preview	Feb 8, 2024 4:41pm

[xoscar]

I understand the idea of having this done in a simpler way for the moment, great job on the quick turn around @schoren!