feat: initial setup

[meghein]

Summary

• Install @fast-csv/parse @fastify/multipart and ajv
• Configure plugin to decorate fastify with csvImport

Test Plan

• Install dependencies with npm
• Run example app with node:

node ./example/index.js

• In a separate terminal, make the following requests:

http -f POST :3000/csv/import file@example/fixtures/valid-products.csv # should respond with an array of products
http -f POST :3000/csv/import file@example/fixtures/large-file.csv # should return an error with appropriate message 
http -f POST :3000/csv/import file@example/fixtures/invalid-fixed-price.csv # should return an error with appropriate message 

[markdeleon-autotelic]

LGTM!