process: split execution entry points into main scripts

[joyeecheung]

Note: there are some indentation changes in lib/internal/bootstrap/node.js so please use https://github.com/nodejs/node/pull/25667/files?w=1 for reviews

process: split execution into main scripts

This patch splits the execution mode selection from the environment
setup in lib/internal/bootstrap/node.js, and split the entry point
of different execution mode into main scripts under
lib/internal/main:

• check_syntax.js: used when -c/--check which only checks the
  syntax of the input instead of executing it.
• eval_stdin.js: used when -e is passed without value and stdin
  is not a TTY (e.g. something is piped).
• eval_string: used when -e is passed along with a string argument
• inspect.js: for node inspect/node debug
• print_bash_completion.js: for --completion-bash
• print_help.js: for --help
• prof_process.js: for --prof-process
• repl.js: for the REPL
• run_main_module.js: used when a main module is passed
• run_third_party_main.js: for the legacy _third_party_main.js
  support
• worker_thread.js: for workers

This makes the entry points easier to navigate and paves the way
for customized v8 snapshots (that do not need to deserialize
execution mode setup) and better embedder APIs.

As an example, after this patch, for the most common case where
Node.js executes a user module as an entry point, it essentially
goes through:

• lib/internal/per_context.js to setup the v8 Context (which is
  also run when setting up contexts for the vm module)
• lib/internal/bootstrap/loaders.js to set up internal binding
  and builtin module loaders (that are separate from the loaders
  accessible in the user land).
• lib/internal/bootstrap/node.js: to set up the rest of the
  environment, including various globals and the process object
• lib/internal/main/run_main_module.js: which is selected from
  C++ to prepare execution of the user module.

This patch also removes NativeModuleLoader::CompileAndCall and
exposes NativeModuleLoader::LookupAndCompile directly so that
we can handle syntax errors and runtime errors of bootstrap
scripts differently.

worker: move worker thread setup code into the main script

This patch directly inlines createMessageHandler() and
createWorkerFatalExeception() in the new
lib/internal/main/worker_thread.js since the implementation
of the two methods are related to the execution flow of
workers.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[nodejs-github-bot]

@joyeecheung build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2359/pipeline

[joyeecheung]

CI: https://ci.nodejs.org/job/node-test-pull-request/20285/

[joyeecheung]

Ideally this should not have been done here - maybe a better place would be the options parser but at that point Environment is not yet available and we do not have a better place to carry this information yet.

[joyeecheung]

I've removed the options changes as those are not really related to the primary purpose of this PR. @addaleax PTAL.

CI: https://ci.nodejs.org/job/node-test-pull-request/20406/

[joyeecheung]

Rebased. CI: https://ci.nodejs.org/job/node-test-pull-request/20431/

[joyeecheung]

Landed in feebdc5...5e1d446

[addaleax]

@joyeecheung This needs a manual backport for v11.x, it seems.