Move type-piracy on startwith/endswith to Compat.jl

[oxinabox]

I think this is a good point and we need to settle it before v1.0 of the package

Originally posted in #3

@KristofferC:

Just namespace these inside Wrangler and have people do import Wrangler.startswith to opt into your version of the functions? No need for type piracy.

@oxinabox:

I debated this option. It ones one of a few, others being type-piracy, and making up new names prefixedby and suffixedby

I would have said it as putting in the docs telling people to always do:

using Wrangingly
using Wranging: startswith, endswith

rather than just using Wrangling.

I think @nickrobinson251 convinced me that type-piracy was the least bad of many options

@nickrobinson251:

yeah... i'm no longer sure type-piracy is the best option. But 🤷‍♂

My thinking was:

• The alternatively-named-function feels a bad compromise because they are really the exact same as startswith/endswith... so they really should be methods of those functions.
• But introducing the name-clash with Base is also pretty un-fun for users.
• Which leaves us with type-piracy... and this is the least-bad version of that bad thing

[oxinabox]

Type-piracy would be fine (/should move to Compat.jl) if the following julia issues are resolve in favor of doing this in Base
JuliaLang/julia#33193
JuliaLang/julia#35033

[oxinabox]

These have been done in Julia 1.5. this need to be moved to Compat.jl

[nickrobinson251]

xref #14

[nickrobinson251]

the 1-arg / "curried" versions of startswith/endswith should move to Compat.jl (following JuliaLang/julia#35052). The Symbol piracy stays here.

[nickrobinson251]

JuliaLang/Compat.jl#719