add Find Me Profile (FMP) support

[JoelSalzesson]

add Find Me Profile (FMP) support, that is Find Me Target https://developer.bluetooth.org/TechnologyOverview/Pages/FMP.aspx

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[beaufortfrancois]

@JoelSalzesson Can you make sure you've signed the CLA first?
Your contribution would come handy with an updated version of https://googlechrome.github.io/samples/web-bluetooth/link-loss.html sample.

[beaufortfrancois]

Nit: Immediate Alert Service

[beaufortfrancois]

@JoelSalzesson (gentle ping)