Few improvements to source installer

[olshanov]

1. Add ability to specify additional build dependencies. For example, Ubuntu 20.04 image provided by Canonical miss zstd package required for kernel build. And Ubuntu 18.04 image lack of cpio package;
2. Add ability to specify kernel LOCALVERSION for new kernel;
3. On Ubuntu, new kernel is ignored if it is older then existing kernel;
4. Add ability to amend kernel config values;

[olshanov]

@microsoft-github-policy-service agree company="Cloud Linux"

[squirrelsc]

@adityagesh @smit-gardhariya @SRIKKANTH Please help checking if there is regression on source installer. Thank you.

[squirrelsc]

@olshanov please fix check errors. You can refer to document to setup vscode or use nox to validate errors locally.