Support EasyCard in Taiwan

[oToToT]

EasyCard is the Metrocard used in Taiwan. It is supported in metrodroid https://github.com/metrodroid/metrodroid/tree/04a603ba639f7a270b7bdbf24158c7d601087c29/src/commonMain/kotlin/au/id/micolous/metrodroid/transit/easycard

There are also some tutorials https://fuzzysecurity.com/tutorials/rfid/4.html, https://fahrplan.events.ccc.de/congress/2010/Fahrplan/attachments/1772_easycard.pdf (with data https://gitea.osmocom.org/laforge/easyhack) on how to read them.

Add a feature request holder here in case anyone (or me) want to implement this.

[JasonHK]

Looks like every EasyCard has different keys. Metroflip probably requires the user to supply keys themselves unless the keys calculation was cracked. Self-supply keys probably safer for Metroflip away from legal troubles as well.