feat: add home, end, and delete cursor functionality

[BendikMann]

This is a continuation of the pull request @gary7530 initially submitted, but did not complete the merge that @funbiscuit requested.

@gary7530's original pull request:

This commit implements support for the Home, End, and Delete keys to improve command-line navigation and editing.

Home Key: Moves the cursor to the beginning of the command line.
End Key: Moves the cursor to the end of the command line.
Delete Key: Removes the character at the current cursor position.

The changes include parsing the corresponding ANSI escape sequences in onEscapedInput within embedded_cli.c.

Please let me know if any additional changes are required.

[gary7530]

Hi @funbiscuit, since @BendikMann has already rebased the changes in #57, we can proceed with that PR instead. I'll close this one to avoid duplication. Thanks!

[funbiscuit]

Can you please add some tests for new commands? Look inside tests/cli files for reference. Probably can be easily vibecoded using existing reference.

It would be also great if you add tests for --help/-h option, they're missing, that's why removal of --help/-h option was not catched by tests.

[BendikMann]

These new commits include tests for the control sequences added by gary7530.

Additionally, and hopefully not controversally they also include changes to the behavior of control character 0x7F (DEL) to properly reflect the DEL control character instead of duplicating \b (BACKSPACE).