feat(assets_info): Return assets versions as invisible table

[gadenbuie]

And use message() instead of cat() to make it easier to suppress the printed output.

info <- assets_info()
#> shinylive R package version:  0.1.1.9000
#> shinylive web assets version: 0.4.1.9000
#> 
#> Local cached shinylive asset dir:
#>     /Users/garrick/Library/Caches/shinylive
#> 
#> Installed assets:
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.4.1.9000
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.4.0
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.3.0
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.8
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.7
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.5
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.4
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.3
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.2
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.1
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.2.0
#>     /Users/garrick/Library/Caches/shinylive/shinylive-0.1.2

info
#> # A tibble: 12 × 3
#>    version    path                                             is_assets_version
#>    <chr>      <fs::path>                                       <lgl>            
#>  1 0.4.1.9000 …k/Library/Caches/shinylive/shinylive-0.4.1.9000 TRUE             
#>  2 0.4.0      …arrick/Library/Caches/shinylive/shinylive-0.4.0 FALSE            
#>  3 0.3.0      …arrick/Library/Caches/shinylive/shinylive-0.3.0 FALSE            
#>  4 0.2.8      …arrick/Library/Caches/shinylive/shinylive-0.2.8 FALSE            
#>  5 0.2.7      …arrick/Library/Caches/shinylive/shinylive-0.2.7 FALSE            
#>  6 0.2.5      …arrick/Library/Caches/shinylive/shinylive-0.2.5 FALSE            
#>  7 0.2.4      …arrick/Library/Caches/shinylive/shinylive-0.2.4 FALSE            
#>  8 0.2.3      …arrick/Library/Caches/shinylive/shinylive-0.2.3 FALSE            
#>  9 0.2.2      …arrick/Library/Caches/shinylive/shinylive-0.2.2 FALSE            
#> 10 0.2.1      …arrick/Library/Caches/shinylive/shinylive-0.2.1 FALSE            
#> 11 0.2.0      …arrick/Library/Caches/shinylive/shinylive-0.2.0 FALSE            
#> 12 0.1.2      …arrick/Library/Caches/shinylive/shinylive-0.1.2 FALSE