Support constructing Peripherals using builder lambda

[twyatt]

Usage details can be found in the README Peripherals section.

Worth mentioning (with more detail beyond the README) is the onServicesDiscovered option (in the builder lambda):
It allows for actions to be performed "after service discovery".

Without this feature, performing an action upon connection required wrapping Kable's Peripheral so that operations could be performed after the connect (additionally, ensuring those operations were idempotent and thread-safe was difficult and error prone).

Kable already incorporates the necessary locks/safe-guards so this makes it possible for consumers to leverage that functionality.

The DiscoveredServicesPeripheral was created to provide a reduced functionality Peripheral which is available in the onServiceDiscovered lambda. It excludes the ability connect or disconnect, whereas connect from the lambda would create a deadlock. So, this limited functionality Peripheral prevents a footgun situation.

[davidtaylor-juul]

🚀 very nice

[sdonn3]

Love it