SIG_ALL signature flag for P2PK (#735)

* n_sigs_refund working, tests added

* update requirements

* wip sigall

* wip

* sigall works

* add signatures for refund

* add mint p2pk tests

* add more p2pk tests

* fix tests

* sign htlc pubkeys as well

* fix htlc and add new test

* fix regtest

* fix new tests with deprecated

* remove asserts

* comments

* new wallet p2pk tests

* getting there

* add more tests

* fixes

* refactor htlc and p2pk validation

* reduce code

* melt with sigall

* fix htlcs

* fix deprecated api tests

* Update cashu/mint/conditions.py

Co-authored-by: lollerfirst <43107113+lollerfirst@users.noreply.github.com>

* refactor sigall validation

---------

Co-authored-by: lollerfirst <43107113+lollerfirst@users.noreply.github.com>

cashu/wallet/helpers.py

@@ -130,10 +130,9 @@ async def send(
         assert len(lock) > 21, Exception(
             "Error: lock has to be at least 22 characters long."
         )
-        if not lock.startswith("P2PK:"):
-            raise Exception("Error: lock has to start with P2PK:")
         # we add a time lock to the P2PK lock by appending the current unix time + 14 days
-        else:
+        if lock.startswith("P2PK:") or lock.startswith("P2PK-SIGALL:"):
+            sigall = lock.startswith("P2PK-SIGALL:")
             logger.debug(f"Locking token to: {lock}")
             logger.debug(
                 f"Adding a time lock of {settings.locktime_delta_seconds} seconds."
@@ -141,10 +140,12 @@ async def send(
             secret_lock = await wallet.create_p2pk_lock(
                 lock.split(":")[1],
                 locktime_seconds=settings.locktime_delta_seconds,
-                sig_all=False,
+                sig_all=sigall,
                 n_sigs=1,
             )
             logger.debug(f"Secret lock: {secret_lock}")
+        else:
+            raise Exception("Error: lock has to start with P2PK: or P2PK-SIGALL:")
 
     await wallet.load_proofs()