[shell] Fix crash on startup for chip-shell

[yufengwangca]

Problem

What is being fixed? Examples:
yufengw@yufengw-SEi:~/Workspace/connectedhomeip/out/debug$ ./chip-shell
[1624926656.614016][17601] CHIP:DL: CHIP task running
[1624926656.614114][17594] CHIP:SH: Max number of modules reached, _commandSetCount:10

chip-shell: ../../src/lib/shell/Engine.cpp:66: void chip::Shell::Engine::RegisterCommands(chip::Shell::shell_command_t*, unsigned int): Assertion `0' failed.
Aborted (core dumped)

We have reached the Max number of modules allowed to register in shell.

Change overview

Increase max number of modules to register from 10 to 32 to accommodate more sub-modules.

Testing

How was this tested? (at least one bullet point required)
Run ./chip-shell and confirm program does not crash.

[github-actions]

Size increase report for "nrfconnect-example-build" from 10a7ac6

File	Section	File	VM
chip-shell.elf	bss	0	704
chip-shell.elf	text	16	16

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-lock.elf and ./pull_artifact/chip-lock.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
bss,704,0
.debug_abbrev,0,380
.debug_info,0,44
text,16,16