Unify examples

This PR merges the chip specific examples into one folder, inside the
esp-wifi project.

To simplify building, alias' have been added to
`esp-wifi/.cargo/config.toml` per chip to automatically select the right
target and enable the chip feature.

Add build script detection for invalid features

Fix CI, use build instead of check to detect linker errors

enable async feature of hal, this breaks because of interrupt definition for systimer

upgrade hal rev

upgrade hal rev c6

undo binding modifications

fix esp now

fix esp coex

use released hals, update async examples

sync example names

sync example names

Update examples.md

Document alias

update build alias

Cargo.toml

@@ -61,4 +61,4 @@ embedded-hal-async = { version = "1.0.0-rc.1" }
 # required until https://github.com/esp-rs/esp-hal/pull/891 is released
 [patch.crates-io]
 esp32c3-hal = { git = "https://github.com/esp-rs/esp-hal.git", rev = "8eddb9e737a1bfe0a36f90f54103e9167114813a" }
-esp-hal-common = {  git = "https://github.com/esp-rs/esp-hal.git", rev = "8eddb9e737a1bfe0a36f90f54103e9167114813a" }
+esp-hal-common = {  git = "https://github.com/esp-rs/esp-hal.git", rev = "8eddb9e737a1bfe0a36f90f54103e9167114813a" }