fix(bash): fix small issues of `enter_accept` for the plain Bash (#1467)

* fix(bash): history should be updated before preexec

* fix(bash): properly execute "--"

With the current implementation, the user command "--" would not be
executed even if it were the intended one.  This is because it would
be confused as an option by the "eval" builtin.  We can specify "--"
to tell "eval" that the later arguments should be literally treated as
the command.

* fix(bash): correctly restore $? and $_

* fix(bash): fix the use of preexec_ret_value

The exit status of preexec_ret_value is used to suppress the execution
of the corresponding command in the extdebug mode.  The current
implementation somehow tries to set $? before the call of stty, which
does not have any effect.  Instead, we can manually turn off the
execution of the user command when the condition matches.

* feat(bash): support array PROMPT_COMMAND of Bash >= 5.1

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