BE 2 - Implement filter_multiple_columns API function

[notjackl3]

Create an API function to filter volunteers by multiple column with configurable logical operations. Here are some resources:

• Our Supabase dashboard's documentation on how to work with Volunteers table
• Our Supabase Volunteer table schema.
• Our Supabase dashboard's documentation on how to work with VolunteersRoles table
• Our Supabase VolunteerRoles table schema.
• Our Supabase dashboard's documentation on how to work with Roles table
• Our Supabase Roles table schema.
• Our Supabase dashboard's documentation on how to work with VolunteersCohorts table
• Our Supabase VolunteerCohorts table schema.
• Our Supabase dashboard's documentation on how to work with Cohorts table
• Our Supabase Cohorts table schema.
• Our database schema which helps you visualize how the tables are connected

Params:

• <filters_list>: An array of tuples (<mini_op>, <field>, <values>), representing the multiple filters that the user wants to apply at once. Here is the breakdown of the each property:
   - <mini_op>: string - Operation to perform (AND [must match all values], OR [must match at least one value]). This will determine how the values in a column filter are combined
   - <field>: string - Field to filter for (e.g Roles, Cohorts, name_org, email, etc.)
   - <values>: stringList - Values from the same column to filter for (e.g. f2f, front_desk).

• < op>: string - Either "OR" or "AND" representing how the filters should be combined, by matching all ("AND") or matching any ("OR") of the filters.

Notes:

• You may assume the implementation and use other API functions (filter_by_cohort, filter_by_role, and filter_general), if you find it convenient.
• Note that roles and cohorts are not columns in the Volunteers table; they are tables themselves (Cohorts and Roles).
• The function shall return the filtered row(s)
• The API functions should be written inside src/lib/api/
• Ensure proper error handling and validation of input data
• If you need to install any dependency, write about it on your PR.

The goal is to:

• Create a GET endpoint that accepts a filters list of many values from the same column with a specific logical operation defined, and returns filtered volunteer(s) from Supabase
• Return appropriate success/error responses with HTTP status codes.