feat(search): make cursor style configurable (#1595)

* feat(search): make cursor style configurable

The vim mode of the interactive Atuin search changes the cursor style
on a mode change, but the current implementation has the following
issues.

* The terminal's cursor style set by the Atuin search remains after
  Atuin exits.  This causes an inconsistency with the shell's setting
  for the cursor style.

* Also, the cursor style for each keymap mode is currently hardcoded
  in the source code, which is not necessarily consistent with the
  user's cursor-style setting in the shell.

* Since the current implementation does not set the cursor style for
  the initial keymap mode but only sets the cursor style when the
  keymap mode is changed, it also causes inconsistency in the cursor
  style and the actual keymap when the shell's keymap and Atuin's
  initial keymap mode are different.

This patch solves those issues by introducing an opt-in configuration
variable `keymap_cursor`.  By default, the vim mode does not change
the cursor style because there is no way to automatically determine
the cursor style consistent with the shell settings.  We enable the
feature only when the user specifies the preferred cursor style in
each mode in their config.  Also, the cursor style is set on the
startup of the Atuin search (based on the initial keymap mode) and is
reset on the termination of the Atuin search (based on the shell's
keymap mode that started the Atuin search).

* chore(settings): remove dependency on crossterm

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