Adding bpm tag leads to addition of several more unwanted tags

Hey, I want to add the bpm tag with the autopbm plugin to my metadata. But it also adds comp = false (if previously set to true) and album artist and album_artists tags and several more.

Also one question: I do not want to use any autotagging whatsoever. i just want to calculate bpm for each file. Is there an option to just do it when using import. because right now i have to set the option (U) for every file.

### Problem

```sh
beet import D:\beets\music

#D:\beets\music\Above Only\(2012) Above Only (1 items)
#No matching release found for 1 tracks.
#For help, see: https://beets.readthedocs.org/en/latest/faq.html#nomatch
#➜ [S]kip, Use as-is, as Tracks, Group albums, Enter search, enter Id, aBort? U

#press U

beet write -P

#Above Only - Above Only - Evil Never Sleeps
# bpm: 0 -> 129

beet write

```

Led to this problem:

Now inspecting the metadata of the file there are many additional tags to the bpm tag. like album_artists , discc, etc. and on other songs where the compilation tag was set. it just want to set it to false.

### Setup

* OS: Windows 10
* Python version: 3.11.4
* beets version: 2.11.0

My configuration (output of `beet config`) is:

```yaml
directory: D:\beets\music
library: D:\beets\musiclibrary.db
import:
copy: no # Use files in place
plugins:
- autobpm
autotag: no
autobpm:
auto: yes
force: no
beat_track_kwargs: {}
quiet: no
```

Start by reproducing the reported workflow with the autobpm plugin and the supplied configuration: run beet import, choose Use as-is, then compare beet write -P with beet write. Inspect which metadata tags change alongside bpm and separately verify whether the configuration can calculate BPM during import without requiring the per-file U choice; done when unwanted tag changes and the import behavior are resolved or clearly documented.

Written by the indexing model from the issue text.