Update Implementation Status to use Repo Names

[platypii]

This PR updates the implementation status table in content/en/docs/File Format/implementationstatus.md to use the repository names instead of the language. This is because the repository name is more specific than the language, and this handles the case where there are multiple implementations in the same language.

So for example, instead of C++, we now have arrow, instead of Java, we now have parquet-java, and so on. From a practical point of view, most users will probably use parquet through pyarrow anyway so maybe this will make it easier for users to understand which libraries support which features.

I added the language in parentheses after the repository name to help users choose a library in their preferred language.

Note: Stylistically I considered using unicode characters 🇷 and 🇼 to indicate read and write support per @wgtmac's suggestion in #102. But different browsers and operating systems render these characters differently, often different size and style from the existing checkmark (✅) and cross (❌) characters. I decided to stick with the existing characters for consistency.

[wgtmac]

@alamb WDYT?

[alamb]

I think this is a great improvement in clarity -- thank you @platypii and @wgtmac for the ping

[wgtmac]

I just merged it. Thanks @platypii and @alamb!