Give us `Profile` and `ProfileStore` types

[lucasmz-dev]

It would be really nice to have exported types for Profile and ProfileStore.
These can be easily made using typeof and setmetatable.

export type Profile = typeof(
    setmetatable({
        Data = {},
        -- All other members, including private ones. (Setting this as the return type of LoadProfileAsync would be nice)
    }, Profile)
)

Currently I don't get auto completion on Roblox's script editor, this would help alot.

[LM-loleris]

Will look into it for the next iteration of ProfileService

[aberrrant]

#36 addresses this :)