Fix CLI utf8 issue

[aziz-mu]

This PR fixes issue #1042, and refactors linenoise.cpp for better utf8 support in the future.

In detail:

• Added a chars tracker to linenoisestate. len now keeps track of the number of single-byte characters in the buffer, while chars keeps track of the actual number of utf8 characters.
• Added a function getBufCharPos, which converts from the cursor's position to the data position in the buffer.
• linenoiseEditInsert still takes in one byte at a time, but it doesn't write it until a full utf-8 character is typed, to prevent it from typing invalid utf-8 characters.

[acquamarin]

The cursor is not in the correct position after i type some utf-8 characters.
You can try copy this utf8 string to the shell, and the cursor doesn't appear in the correct position

[acquamarin]

Got seg fault for this utf-8 string:

z473chen@ubuntu:/data0/kuzu/build/release/tools/shell$ ./kuzu_shell  -i dsad
Opened the database at path: dsad
Enter ":help" for usage hints.
kuzu> 大苏打Segmentation fault (core dumped)

[acquamarin]

There is still a bug when the user types a very long utf-8 string in the shell:

z473chen@ubuntu:/data0/kuzu/build/release/tools/shell$ ./kuzu_shell  -i 12451
Opened the database at path: 12451
Enter ":help" for usage hints.
kuzu> 顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶
kuzu> 顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶
kuzu> 顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶顶

The text appears in multiple lines rather than a single line