Support +/$text command line argument

This is a feature found in vim and for example used by Linux kernel test robots to give context about warnings and/or failures.

e.g. vim +/imem_size +623 drivers/net/ipa/ipa_mem.c

Means to search for imem_size and move cursor to line 623.

The behavior found in VIM is as follows:

• If line:col is specified before the search starts from that position and if a match is found the cursor jumps to the match (also wrapping around the buffer).
• If the search if specified before and a match is found it highlights the search field and then moves the cursor as specified in line:col.

As for multi-file handling it applies the last rule in command line takes over.

Not sure if that's something you'd be interesting to support but it's quite handy.

There's a crude implementation here https://github.com/luca020400/micro/commit/894043ae3f9704d2d6bb91c082be618f385ddb58 that implements it in an hacky way via .Search (couldn't find a proper API for now)

Ty.

Start by reviewing the crude implementation in commit 894043ae3f9704d2d6bb91c082be618f385ddb58 and trace the command-line argument handling it uses. Compare the implementation with the requested Vim behavior for search, line:col positions, wrapping, highlighting, and multiple files. Done means the +/$text argument works consistently for those cases with appropriate tests.