Add support for retrieving and running parameterized reports from a Git repository

Develop a method of retrieving SQL reports (authored elsewhere) from a Git repository and running them with user-specified parameters. This functionality is somewhat separate from the form-based query builder, though part of the same App. It also makes use of a settings screen for configuring URLs/connections to Git repositories.

The reporting community's SQL queries—for example in https://github.com/folio-org/folio-analytics/tree/main/sql/report_queries—already implement similar functionality encoded in the SQL. For example:

https://github.com/folio-org/folio-analytics/blob/main/sql/report_queries/title_count/title_count.sql

At the top of the query there is a clause that begins "WITH parameters AS" which contains the parameters. The user takes the query and fills in some of those parameters.

A separate metadata file (in JSON or a simpler, standard format) will be located in the same directory with the SQL query file(s). For each parameter the metadata include the parameter name, data type, allowed values or range of values, and text description. User-supplied values are merged into the parameters defined in SQL by some method to be determined. For example, the parameter definition could be preceded by a comment line containing the parameter name in {{ and }}:

Merging the values in this way cannot be done by a simple, global template substitution, but it could be done by processing the SQL line-by-line.