Message path autocomplete suggestions are not useful in some cases

Description The message path autcomplete suggestions in this file are not useful and lead to empty plots

• Version: 1.2.0
• OS: macOS

Steps To Reproduce

1. Load this mcap file into studio
2. Create a plot panel
3. Select one of the suggested plot paths like /base_footprint.transforms[:]{child_frame_id==0}.transform.rotation.y

test.mcap.zip

Current Experience The suggested paths result in empty plots.

Desired Experience In this case studio should suggest something that will actually result in a useful plot like:

/base_footprint.transforms[:]{child_frame_id=='base_footprint'}.transform.rotation.y

or

/base_footprint.transforms[:].transform.rotation.y

[jhurliman]

Changing to a bug since child_frame_id can never match against 0

[defunctzombie]

We need to take the type into account for the autocomplete suggestion.