signer: change the stdio jsonrpc to use legacy namespace conventions (#19047)

This PR will will break existing UIs, since it changes all calls like ApproveSignTransaction to be on the form ui_approveSignTransaction.

This is to make it possible for the UI to reuse the json-rpc library from go-ethereum, which uses this convention.

Also, this PR removes some unused structs, after import/export were removed from the external api (so no longer needs internal methods for approval)

One more breaking change is introduced, removing passwords from the ApproveSignTxResponse and the likes. This makes the manual interface more like the rulebased interface, and integrates nicely with the credential storage. Thus, the way it worked before, it would be tempting for the UI to implement 'remember password' functionality. The way it is now, it will be easy instead to tell clef to store passwords and use them.

If a pw is not found in the credential store, the user is prompted to provide the password.

cmd/clef/intapi_changelog.md

@@ -1,5 +1,40 @@
 ### Changelog for internal API (ui-api)
 
+### 6.0.0 
+
+Removed `password` from responses to operations which require them. This is for two reasons, 
+
+- Consistency between how rulesets operate and how manual processing works. A rule can `Approve` but require the actual password to be stored in the clef storage. 
+With this change, the same stored password can be used even if rulesets are not enabled, but storage is. 
+- It also removes the usability-shortcut that a UI might otherwise want to implement; remembering passwords. Since we now will not require the 
+password on every `Approve`, there's no need for the UI to cache it locally. 
+  - In a future update, we'll likely add `clef_storePassword` to the internal API, so the user can store it via his UI (currently only CLI works). 
+
+Affected datatypes:
+- `SignTxResponse`
+- `SignDataResponse`
+- `NewAccountResponse`
+
+If `clef` requires a password, the `OnInputRequired` will be used to collect it. 
+
+
+### 5.0.0 
+
+Changed the namespace format to adhere to the legacy ethereum format: `name_methodName`. Changes:
+
+* `ApproveTx` -> `ui_approveTx`
+* `ApproveSignData` -> `ui_approveSignData`
+* `ApproveExport` -> `removed`
+* `ApproveImport`  -> `removed`
+* `ApproveListing`  -> `ui_approveListing`
+* `ApproveNewAccount`  -> `ui_approveNewAccount`
+* `ShowError` -> `ui_showError`
+* `ShowInfo` -> `ui_showInfo`
+* `OnApprovedTx` -> `ui_onApprovedTx`
+* `OnSignerStartup` -> `ui_onSignerStartup`
+* `OnInputRequired` -> `ui_onInputRequired`
+
+
 ### 4.0.0
 
 * Bidirectional communication implemented, so the UI can query `clef` via the stdin/stdout RPC channel. Methods implemented are: