emacs: configure dap-mode and compile-mode

Debug Adapter Protocol (DAP) is wire protocol to communicate between a
client and debug server. This is similar to LSP, but for debuggers.

This initial configuration focuses on enabling the mode and setting the
layout for the various buffers (in this case I want the different
buffers on the right screen and keep the main part focused on the code).
I also disable some widget to use the debugger with hydra.

There's still a number of things that are incomplete when it comes to
integrate DAP and delve (the go debugger): there's no way to call
functions, to have access to the variables, etc. But this is a good
start though, to debug simple problems without relying on print
statement.

This also update the configuration for =go= so that =M-x compile=, when
editing a go file, by default will use =go build=. This is not what I
always need / want but this is a good default.

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