Bw-timex

* Fixed rounding in dynamic_lcia to avoid duplicate entries in dynamic inventory

* Added rounding to 3 decimal places for interpolation weights

* Added support for passing Node objects to `bw_timex.utils.get_exchange` and `bw_timex.utils.add_temporal_distribution_to_exchange`.

* Modified the date rounding behavior: Instead of always rounding off the dates in the timeline (using the resolution specified in temporal_grouping), we now round to the nearest year/month/day/hour (depending on temporal_grouping).
* Fixed interface to dynamic_characterization (see https://github.com/brightway-lca/dynamic_characterization/releases/tag/v1.0.0) and pinned version to >=1.0.0.

* Added optional `starting_datetime` argument to `TimexLCA.build_timeline` explicitly. Before, it was buried in *args, which were passed to the underlying graph traversal (https://github.com/brightway-lca/bw_timex/pull/93)
* Allow multiple calls of `build_timeline` using the same `TimexLCA` object, e.g., using different `starting_datetime` (https://github.com/brightway-lca/bw_timex/pull/94)
* Fixed unintuitive rounding down of timestamps in dynamic characterization. 2024-12-31 would have been rounded to 2024, whereas 2025 makes more sense here. Now we round to the nearest year (https://github.com/brightway-lca/bw_timex/commit/21fa55bbcafee196447840c6518b5fee49fb6660)

* Added labels and units to the yaxis in `TimexLCA.plot_dynamic_characterized_inventory()`
* Fixed functions for creating labelled matrix representations