fix(bash): work around bash < 4 and introduce initialization guards (#1533)

* fix(bash): add a guard for interactive shells

* fix(bash): add a guard for the Bash version

* fix(bash): localize READLINE_LINE in bash < 4

In bash < 4, the variables READLINE_LINE and READLINE_POINT are not
supported for the shell commands called by `bind -x`.  Even if it is
not supported, atuin works in not a bad way.  However, this sometimes
causes a strange behavior by the remaining values of READLINE_LINE set
in the previous calls of __atuin_history.  In bash < 4, we can
consistently use an empty string instead of $READLINE_LINE, and the
changes to READLINE_LINE and READLINE_POINT should be localized within
the function.

* fix(bash): add guard for double initialization

In bash, it is customary to reload the settings by sourcing `.bashrc`
again after modifying it.  In such a case, `eval "$(atuin init bash)"`
is executed again.  This registers duplicate hooks to
`preexec_functions` and `precmd_functions`.  To prevent this in this
patch, we introduce an include guard, so that the initialization is
not performed more than once.

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