std.hash.RapidHash: remove

Its design keeps evolving. See
https://github.com/Nicoshev/rapidhash/releases

It's great to see the design improving, but over time, this will lead to
code rot; versions that aren't widely used but would still have to live
in the standard library forever and be maintained.

Better to be maintained as an external dependency that applications can
opt into. Then, in a few years, if a version proves to be stable and
widely adopted, it could be considered for inclusion in the standard
library.

Author: andrewrk

lib/std/hash.zig

@@ -32,8 +32,6 @@ pub const CityHash64 = cityhash.CityHash64;
 const wyhash = @import("hash/wyhash.zig");
 pub const Wyhash = wyhash.Wyhash;
 
-pub const RapidHash = @import("hash/RapidHash.zig");
-
 const xxhash = @import("hash/xxhash.zig");
 pub const XxHash3 = xxhash.XxHash3;
 pub const XxHash64 = xxhash.XxHash64;

lib/std/hash/RapidHash.zig

@@ -59,12 +59,6 @@ const hashes = [_]Hash{
         .ty = hash.crc.Crc32,
         .name = "crc32",
     },
-    Hash{
-        .ty = hash.RapidHash,
-        .name = "rapidhash",
-        .has_iterative_api = false,
-        .init_u64 = 0,
-    },
     Hash{
         .ty = hash.CityHash32,
         .name = "cityhash-32",