feat: changes name of delete command

[kiwisurgen]

Closes #145

$./momento cache
momento-cache 
Interact with caches

USAGE:
    momento cache [OPTIONS] <SUBCOMMAND>

OPTIONS:
    -h, --help       Print help information
        --verbose    

SUBCOMMANDS:
    create-cache    Create a cache
    delete-cache    Delete the cache
    get             Get an item from the cache
    help            Print this message or the help of the given subcommand(s)
    list-cache      List all caches
    set             Store a given item in the cache

[kvcache]

so this would make people need to type

momento cache createcache --name cachename

right? I'm not convinced that writing cache again right after writing cache is removing any lack of clarity that already exists. Can you explain the motivation behind this change?

[eaddingtonwhite]

@kvcache he was going directly off this ticket per @danielamiao comments. Im updating pr w/ ticket link as well now.
#145

I know we had talked as well to collapse commands down to root of CLI but would rather that be follow up pr then after this initial refactor for ticket @WillRInternship working on now.

[eaddingtonwhite]

also this boils down to momento cache create-cache --name cachename with how clap parses commands currently just FYI it adds in the -

[kvcache]

i'm not aligned... let's take this to slack or zoom.

[eaddingtonwhite]

ok we clarified w/ @danielamiao we want to move down to root. @WillRInternship check out comment here.
#145 (comment)

Id still from implementation wise get delete added first make sure works as you would expect. Then can make a follow up commit to get rid of the cache subcommand and move all the commands down to root of CLI like @danielamiao saying in ticket.

[poppoerika]

Closing this pr for now and will come back to work on the updates.
cc @cprice404