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This commit adds a `MarshalText` implementation to the `crypto.Context` type. The `MarshalText` implementation replaces the `WriteTo` and `AppendTo` implementation. It is slightly slower than the `AppendTo` implementation ``` goos: darwin goarch: arm64 pkg: github.com/minio/minio/cmd/crypto BenchmarkContext_AppendTo/0-elems-8 381475698 2.892 ns/op 0 B/op 0 allocs/op BenchmarkContext_AppendTo/1-elems-8 17945088 67.54 ns/op 0 B/op 0 allocs/op BenchmarkContext_AppendTo/3-elems-8 5431770 221.2 ns/op 72 B/op 2 allocs/op BenchmarkContext_AppendTo/4-elems-8 3430684 346.7 ns/op 88 B/op 2 allocs/op ``` vs. ``` BenchmarkContext/0-elems-8 135819834 8.658 ns/op 2 B/op 1 allocs/op BenchmarkContext/1-elems-8 13326243 89.20 ns/op 128 B/op 1 allocs/op BenchmarkContext/3-elems-8 4935301 243.1 ns/op 200 B/op 3 allocs/op BenchmarkContext/4-elems-8 2792142 428.2 ns/op 504 B/op 4 allocs/op goos: darwin ``` However, the `AppendTo` benchmark used a pre-allocated buffer. While this improves its performance it does not match the actual usage of `crypto.Context` which is passed to a `KMS` and always encoded into a newly allocated buffer. Therefore, this change seems acceptable since it should not impact the actual performance but reduces the overall code for Context marshaling.