Add query based searching functions

Major changes
findAirport(query)
This function takes a query string as an argument and returns the airport object matching the query, or null if no match was found.

findAirline(query)
This function takes a query string as an argument and returns the airline object matching the query, or null if no match was found.

What's Changed

• • fix typo by @baba-mandef in #2
• Add global searching by @baba-mandef in #3

New Contributors

• @baba-mandef made their first contribution in #2

Full Changelog: v1.3.9...1.3.15