Rust script to import member data from CSV

[Iron-56]

Fixes: #161

This PR adds support for storing member social media information including phone numbers, GitHub/GitLab profiles, and social media handles.

Description

I have made a script in rust to update the existing member data table which can be used by passing a parameter. eg:
cargo run --bin import_csv "Member List.csv"

Type of Change:

• New feature

Related Issue

Fixes: #161

Changes

• Added bin/import_csv.rs as a helper file to import members
• Added migration for social links
• Added function to import members from a csv
• Updated docs for seeding.

Checklist

• Code follows Rust conventions (cargo fmt and cargo clippy pass)
• Self-review of code completed
• Code is modular and uses descriptive naming
• Database migrations added/updated (if applicable)
• Documentation updated (if applicable)
• Tested locally with cargo run
• No breaking changes to existing API endpoints (or documented if necessary)