sim: Add Berry interpreter configuration

[speccy88]

Summary

• Add Berry interpreter documentation under Documentation/applications/interpreters/berry.
• Add a sim:berry configuration that enables the Berry interpreter and its required dependencies.

Context

This is the NuttX-side companion for the optional Berry interpreter app proposed in apache/nuttx-apps#3564.

Testing

Built sim:berry against apache/nuttx-apps#3564 locally on macOS arm64:

./tools/configure.sh -a ../nuttx_apps_berry_pr sim:berry
make olddefconfig
make -j8

Runtime smoke test:

NuttShell (NSH)
nsh> berry -v
Berry 1.1.0
nsh> berry -e print(40+2)
42
nsh> berry
Berry 1.1.0 (build in Jun 26 2026, 09:34:41)
[clang 21.0.0 (clang-2100.1.1.101)] on NuttX (default)
> import os
> os.exit(0)
nsh>

[github-actions]

MemBrowse Memory Report

esp32-devkitc

• ROM: .flash.text -8 B (-0.0%, 119,772 B / 4,194,272 B, total: 3% used)
• irom0_0_seg: .flash.text -8 B (-0.0%, 85,052 B / 3,342,304 B, total: 3% used)

hifive1-revb

• flash: .text +4 B (+0.0%, 80,196 B / 4,194,304 B, total: 2% used)

qemu-armv8a

• Code: .rodata +8 B, .text.cmd_echo -16 B (-0.0%, 312,150 B)

qemu-intel64

• Code: .text -3 B (-0.0%, 8,653,200 B)

rx65n-rsk2mb

• ROM: .rodata +4 B (+0.0%, 83,108 B / 2,097,152 B, total: 4% used)
  No memory changes detected for:
• arduino-mega2560
• mirtoo
• s698pm-dkit
• stm32-nucleo-f103rb

[simbit18]

Hi @speccy88 please fix

../nuttx/tools/checkpatch.sh -c -u -m -g  f5e3bb24595b78c5e329d13b1ad559a294ed3ef9..HEAD
❌ Missing Signed-off-by
Used config files:
    1: .codespellrc
Some checks failed. For contributing guidelines, see:
  https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md

Doc

Warning, treated as error:
/home/runner/work/nuttx/nuttx/Documentation/applications/interpreters/berry/index.rst:1:Title overline too short.

=================================
``berry`` Berry scripting language
=================================
make: *** [Makefile:52: html] Error 2