extend command palette with command description + Searchable

[muescha]

Why

some commands has changed and some commands have names which is hard to guess.

for example DirStat is now Analyze Disk Usage (#924)

i tried many keywords to remember how a folder size is calculated but i not catch it:

• size
• du
• calculate
• folder

what i see

i can only find commands with exact match of the name

what i expect

i suggest to add some description and keywords to the commands palette.

then extend the search to keywords and at least to the description

search order:

• command
• keyword
• description

then it is possible to add some hints to a command