encoding/json: Add custom JSON package with build tag support for Sonic (#1623)

* tag optional sonic and allow full library conversion

* Add workflow and disallow arm and darwin usage

* Add basic hotswap benchmark

* linter: fix

* use bash

* linter: fix?

* Fix whoopsie, add to make file, also add mention in features list.

* test enforcement

* actually read documentation see if this works

* linter: fix

* linter: fix

* sonic: bump tagged version

* encoding/json: drop build tag arch and os filters

* encoding/json: consolidate tests

* encoding/json: log build tag usage

* rm superfluous builds

* glorious/nits: add template change and regen docs

* glorious/nits: update commentary on nolint directive

* glorious/nits: rm init func and log results in main.go

* Test to actually pull flag in

* linter: fix

* thrasher: nits

* gk: nits 4 goflags goooooooooo!

* gk: nits rn

* make sonic default json implementation

* screen 386

* linter: fix

* Add commentary

* glorious: nits Makefile not working

* gk: nits

* gk: nits whoops

* whoopsirino

* mention 32bit systems won't be sonic

* gk: super-duper nit of extremes

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>

encoding/json/common.go

@@ -0,0 +1,16 @@
+// json is an abstraction middleware package to allow switching between json encoder/decoder implementations
+// The default implementation is sonic.
+// Build with `sonic_off` or `386` tags to switch to golang.org/encoding/json.
+package json
+
+import "encoding/json" //nolint:depguard // Acceptable use in gct json wrapper
+
+type (
+	// RawMessage is a raw encoded JSON value.
+	// It implements [Marshaler] and [Unmarshaler] and can
+	// be used to delay JSON decoding or precompute a JSON encoding.
+	RawMessage = json.RawMessage
+	// An UnmarshalTypeError describes a JSON value that was
+	// not appropriate for a value of a specific Go type.
+	UnmarshalTypeError = json.UnmarshalTypeError
+)