test-utils: programatically spawn dev nodes (#14704)

* allow spinning up dev node in background without binary

* improve comments

* restore rust-toolchain

* remove rust-toolchain

* tweak start_node_without_binary api

* Update test-utils/cli/src/lib.rs

Co-authored-by: Alexandru Vasile <[email protected]>

* address commends

* use &str

* update example

* update comment

* update docs

* Revert "update docs"

This reverts commit e18677f081247dd9672f64ea34d2c651daf401c2.

* use node-cli instead of node-template

* fix feature

* fix feature

* fix features

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Co-authored-by: Alexandru Vasile <[email protected]>