Remove Amino encoding support (#775)

Amino is a legacy pre-Protobuf serialization format used by early Cosmos
chains, however pretty much all of them have migrated to Protobuf by
this point.

Supporting both Amino and Protobuf is quite difficult as it completely
duplicates effort for all serialized messages, with separate `prost` and
`prost_amino` dependencies (where `prost_amino` is unmaintained) and
message types which duplicate each other for both formats. TMKMS made it
work by transcoding Protobuf to Amino back to Protobuf (for both
requests and responses).

This commit fully moves TMKMS to be natively Protobuf and Protobuf
alone.

The test suite previously only exercised the Amino functionality and has
been fully updated to use Protobufs instead.

Cargo.toml

@@ -5,7 +5,7 @@ Tendermint Key Management System: provides isolated, optionally HSM-backed
 signing key management for Tendermint applications including validators,
 oracles, IBC relayers, and other transaction signing applications
 """
-version = "0.12.2"
+version = "0.13.0-pre"
 authors = ["Tony Arcieri <tony@iqlusion.io>", "Ismail Khoffi <Ismail.Khoffi@gmail.com>"]
 license = "Apache-2.0"
 repository = "https://github.com/iqlusioninc/tmkms/"
@@ -17,7 +17,6 @@ rust-version = "1.65"
 
 [dependencies]
 abscissa_core = "0.7"
-bytes_v0_5 = { version = "0.5", package = "bytes" }
 bytes = "1"
 chrono = "0.4"
 clap = "4"
@@ -32,8 +31,6 @@ k256 = { version = "0.11", features = ["ecdsa", "sha256"] }
 ledger = { version = "0.2", optional = true }
 once_cell = "1.5"
 prost = "0.11"
-prost-amino = "0.6"
-prost-amino-derive = "0.6"
 prost-derive = "0.11"
 rand_core = { version = "0.6", features = ["std"] }
 rpassword = { version = "6", optional = true }
@@ -48,7 +45,7 @@ tempfile = "3"
 tendermint = { version = "0.27", features = ["secp256k1"] }
 tendermint-config = "0.27"
 tendermint-proto = "0.27"
-tendermint-p2p = { version = "0.27", features = ["amino"] }
+tendermint-p2p = "0.27"
 thiserror = "1"
 url = { version = "2.2.2", features = ["serde"], optional = true }
 uuid = { version = "1", features = ["serde"], optional = true }