[smart] fixup of script execution

[polarvid]

拉取/合并请求描述：(PR description)

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为什么提交这份PR (why to submit this PR)

This patch fixup the script execution capabilities on argv passing
and adds support for arguments larger than 4k.

According to POSIX, the script parameter is quiet different
from the current implementation. Especially on the way it inserts
the path of executables. At the end, when you execute a script
from $PATH, it always fails.

For the script, interpreter will be invoked with the following
arguments: {interpreter [optional-arg] pathname arg...}
where pathname is the pathname of the file specified as the first
argument of execve(), and arg... is the series of words pointed
to by the argv argument of execve(), starting at argv[1]. Note that
there is no way to get the argv[0] that was passed to the
execve() call.

你的解决方案是什么 (what is your solution)

A new Object called lwp_args is added to parsing arguments, compiling
them into args segment in user address space.

The changes include:

• Separating argument, environment variable, and auxiliary vector
  processing into a new lwp_args.c file.
• Fixing bugs in script argument processing and supporting arguments
  larger than 4k.
• Updating lwp_execve to use the new argscopy function and removing
  the old lwp_argscopy function.
• Making various modifications to lwp_load and elf_aux_fill to work
  with the new argument processing.
• Removing unnecessary code related to dynamic loading and interpreter
  scripts.

请提供验证的bsp和config (provide the config and bsp)

• BSP:

• .config:

• action:

]

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
• 已经使用formatting 等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification