Experimental database API

[kddnewton]

Allows doing something like this:

require "sqlite3"

database = SyntaxTree::Database::Connection.new(SQLite3::Database.new(":memory:"))
database.prepare

Dir[File.expand_path("../lib/**/*.rb", __dir__)].each do |filepath|
  database.index_file(filepath)
end

database.search("Binary[left: Binary]").each do |row|
  p row
end