fix(json-type): add support for JSON columns in the service dashboard

[Perseus]

Fixes #1023

• Adds a useJsonColumns hook which returns the names of all JSON columns in a specific table
• Modifies the syntax used to access attributes in the traces table based on the type of the column
• Changes some coalesce(nullIf(...)) queries to access the fields directly due to ClickHouse not supporting NULLIF() on dynamic columns

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[Perseus]

@wrn14897 @knudtty
Thanks for the review!

I've made a function to generalize the creation of coalesced queries based on both of your comments; it feels a little awkward since its building the queries manually and I've tried to keep the queries well-indented to make troubleshooting easier without adding significant amounts of whitespace, but it would be significantly easier if there was a standardized query builder (or I could also write a query builder specifically for this use-case if that sounds better).

I've addressed the remaining comments as well.

[knudtty]

This is a great contribution! Thank you for the fix

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