only allow big|small as 2nd arg in search-pattern

[maumaubebe]

Description

What patch does: If not required parameters is passed in search-pattern it will return the usage information. search-pattern PATTERN [little|big] [section]

Previously the options are slightly confusing with two optional arguments and no sanitize checks for big|endian
For example
search-pattern 0x41414141 heap would be evalutated to search-pattern 0x41414141 little

Checklist

• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• If my change adds new code, adequate tests have been added.
• I have read and agree to the CONTRIBUTING document.

[github-actions]

🤖 Coverage update for 6c16e35 🔴

	Old	New
Commit	ee605f9	6c16e35
Score	71.0775%	71.0582% (-0.0193)

[Grazfather]

Can you try to use the parse_arguments decorator?