[feature request] support for oil.nvim highlight groups

[saucoide]

Currently oil.nvim buffers get highlights for directories, icons, etc which clash with the rest of the buffer and makes everything look dark grey font on darker grey background and looks kind of broken

These seem to be what oil uses and the scheme doesn't define, can we add specific support for this plugin?

HIGHLIGHTS                                                        *oil-highlights*

OilHidden                                                           *hl-OilHidden*
    Hidden entry in an oil buffer

OilDir                                                                 *hl-OilDir*
    Directory names in an oil buffer

OilDirHidden                                                     *hl-OilDirHidden*
    Hidden directory names in an oil buffer

OilDirIcon                                                         *hl-OilDirIcon*
    Icon for directories

OilSocket                                                           *hl-OilSocket*
    Socket files in an oil buffer

OilSocketHidden                                               *hl-OilSocketHidden*
    Hidden socket files in an oil buffer

OilLink                                                               *hl-OilLink*
    Soft links in an oil buffer

OilOrphanLink                                                   *hl-OilOrphanLink*
    Orphaned soft links in an oil buffer

OilLinkHidden                                                   *hl-OilLinkHidden*
    Hidden soft links in an oil buffer

OilOrphanLinkHidden                                       *hl-OilOrphanLinkHidden*
    Hidden orphaned soft links in an oil buffer

OilLinkTarget                                                   *hl-OilLinkTarget*
    The target of a soft link

OilOrphanLinkTarget                                       *hl-OilOrphanLinkTarget*
    The target of an orphaned soft link

OilLinkTargetHidden                                       *hl-OilLinkTargetHidden*
    The target of a hidden soft link

OilOrphanLinkTargetHidden                           *hl-OilOrphanLinkTargetHidden*
    The target of an hidden orphaned soft link

OilFile                                                               *hl-OilFile*
    Normal files in an oil buffer

OilFileHidden                                                   *hl-OilFileHidden*
    Hidden normal files in an oil buffer

OilCreate                                                           *hl-OilCreate*
    Create action in the oil preview window

OilDelete                                                           *hl-OilDelete*
    Delete action in the oil preview window

OilMove                                                               *hl-OilMove*
    Move action in the oil preview window

OilCopy                                                               *hl-OilCopy*
    Copy action in the oil preview window

OilChange                                                           *hl-OilChange*
    Change action in the oil preview window

OilRestore                                                         *hl-OilRestore*
    Restore (from the trash) action in the oil preview window

OilPurge                                                             *hl-OilPurge*
    Purge (Permanently delete a file from trash) action in the oil preview
    window

OilTrash                                                             *hl-OilTrash*
    Trash (delete a file to trash) action in the oil preview window

OilTrashSourcePath                                         *hl-OilTrashSourcePath*
    Virtual text that shows the original path of file in the trash

If i have time i can try to take a look at this myself, but i'm new to lua so can't promise much