[FEATURE REQ] Add contract types to contract data

[mrcaseb]

Contract types live on player pages and need to be joined to historical contracts. That's a bit tricky in the current setup because player pages and contract history are treated independent of each other

[mrcaseb]

Code to extract contract history on player pages

  contract_history <-
    xml2::xml_find_all(html_scrape, ".//h4[text()='Contract History']/following-sibling::table") %>%
    rvest::html_table() %>%
    purrr::pluck(1)

I am not sure about the robustness of the xpath. It may or may not work on all player pages