added sigma v2 cased modifier support

[hitenkoku]

What Changed

• added sigma v2 cased modifier support

[fukusuket]

I confirmed startwith/contains/endswith + cased works :) LGTM!!🚀
I tested with following rule.

eventcreate /t INFORMATION /id 1 /d "abc"

title: cased TEST
id: 0550d910-7787-4892-9791-c1c6a26ec16a
status: test
author: TEST
logsource:
    product: windows
    category: application
detection:
    selection:
        EventID: 1
        Channel: Application
        Data|startswith|cased: "a"
        #Data|startswith|cased: "A"
        #Data|endswith|cased: "c"
        #Data|endswith|cased: "C"
        #Data|contains|cased: "b" 
        #Data|contains|cased: "B"               
    condition: selection
level: informational

also there is no diff compared with main.
https://github.com/Yamato-Security/hayabusa/actions/runs/10415100229

[YamatoSecurity]

@fukusuket Thanks for testing! @hitenkoku LGTM! Thanks so much!