feat: support additional history filenames in replxx importer (#3005)

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The original implementation of the `replxx` importer, from PR #2024,
only supported `.histfile` as a filename for the history file, since
there is no default filename. However, the replxx codebase does use
`replxx_history.txt` as an example history filename (see
[here](https://github.com/AmokHuginnsson/replxx/blob/release-0.0.4/examples/c-api.c#L183)
and
[here](https://github.com/AmokHuginnsson/replxx/blob/release-0.0.4/examples/cxx-api.cxx#L383)),
so this patch adds support for that as an alternative filename.

The implementation was modeled after [the
one](https://github.com/atuinsh/atuin/blob/v18.10.0/crates/atuin-client/src/import/zsh.rs#L29-L44)
currently used for the `zsh` history file importer, which also means the
`replxx` importer now produces a human-friendly error if no history file
is found in the expected path(s).

## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the
same thing

/cc @amosbird who introduced this importer in #2024.

0 files changed, 0 insertions, 0 deletions