f53dbbc505 test: Add functional tests for named argument parsing (zaidmstrr)
694f04e2bd rpc: Handle -named argument parsing where '=' character is used (zaidmstrr)
Pull request description:
Addresses [comment](https://github.com/bitcoin/bitcoin/pull/31375#discussion_r2091886628) and [this](https://github.com/bitcoin/bitcoin/pull/31375#discussion_r2092039999).
The [PR #31375](https://github.com/bitcoin/bitcoin/pull/31375) got merged and enables `-named` by default in the `bitcoin rpc` interface; `bitcoin rpc` corresponds to `bitcoin-cli -named` as it's just a wrapper. Now, the problem arises when we try to parse the positional paramater which might contain "=" character. This splits the parameter into two parts first, before the "=" character, which treats this as the parameter name, but the other half is mostly passed as an empty string. Here, the first part of the string is an unknown parameter name; thus, an error is thrown. These types of errors are only applicable to those RPCs which might contain the `=` character as a parameter. Some examples are `finalizepsbt`, `decodepsbt`, `verifymessage` etc.
This is the one example of the error in `finalizepsbt` RPC:
```
./bitcoin-cli -named -regtest finalizepsbt cHNidP8BAJoCAAAAAqvNEjSrzRI0q80SNKvNEjSrzRI0q80SNKvNEjSrzRI0AAAAAAD9////NBLNqzQSzas0Es2rNBLNqzQSzas0Es2rNBLNqzQSzasBAAAAAP3///8CoIYBAAAAAAAWABQVQBGVs/sqFAmC8HZ8O+g1htqivkANAwAAAAAAFgAUir7MzgyzDnRMjdkVa7d+Dwr07jsAAAAAAAAAAAA=
error code: -8
error message:
Unknown named parameter cHNidP8BAJoCAAAAAqvNEjSrzRI0q80SNKvNEjSrzRI0q80SNKvNEjSrzRI0AAAAAAD9////NBLNqzQSzas0Es2rNBLNqzQSzas0Es2rNBLNqzQSzasBAAAAAP3///8CoIYBAAAAAAAWABQVQBGVs/sqFAmC8HZ8O+g1htqivkANAwAAAAAAFgAUir7MzgyzDnRMjdkVa7d+Dwr07jsAAAAAAAAAAAA
```
This PR fixes this by updating the `vRPCConvertParams` table that identifies parameters that need special handling in `-named` parameter mode. The parser now recognises these parameters and handles strings with "=" char correctly, preventing them from being incorrectly split as parameter assignments.
ACKs for top commit:
ryanofsky:
Code review ACK f53dbbc505. Just applied comment & test suggestions since last review
kannapoix:
Code review ACK: f53dbbc505
achow101:
ACK f53dbbc505
Tree-SHA512: 1b517144efeff45a4c4256c27a39ddf187f1d6189d133402a45171678214a10ff2925c31edcfd556d67f85bd26d42f63c528b941b68c9880eab443f2c883e681
a7f9bbe4c5