SHELL_DEFAULT_TERMINAL_WIDTH should be configurable in Kconfig

[czeslawmakarski]

By default the shell subsystem wraps the output of the device by the SHELL_DEFAULT_TERMINAL_WIDTH, which has the value of 80. It is not acceptable in some cases, so this define should be available in Kconfig. One could set it to a desired large value to avoid wrapping the output (so no unnecessary characters are present).