no_std compatibility for subxt-signer (#1477)

* subxt-signer no-std

* impl error

* address james comments

* fix signer wasm tests

* error impl for secret uri error

Cargo.lock

@@ -2865,6 +2865,17 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
+[[package]]
+name = "password-hash"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346f04948ba92c43e8469c1ee6736c7563d71012b17d40745260fe106aac2166"
+dependencies = [
+ "base64ct",
+ "rand_core 0.6.4",
+ "subtle",
+]
+
 [[package]]
 name = "paste"
 version = "1.0.14"
@@ -2887,6 +2898,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8ed6a7761f76e3b9f92dfb0a60a6a6477c61024b775147ff0973a02653abaf2"
 dependencies = [
  "digest 0.10.7",
+ "password-hash",
 ]
 
 [[package]]
@@ -4660,6 +4672,8 @@ name = "subxt-signer"
 version = "0.34.0"
 dependencies = [
  "bip39",
+ "cfg-if",
+ "derive_more",
  "getrandom",
  "hex",
  "hmac 0.12.1",
@@ -4674,7 +4688,6 @@ dependencies = [
  "sp-core-hashing",
  "sp-keyring",
  "subxt",
- "thiserror",
  "zeroize",
 ]