runtime-sdk: Add support for signed queries

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #984 (dfc84f1) into main (607b930) will decrease coverage by 31.42%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #984       +/-   ##
===========================================
- Coverage   67.95%   36.53%   -31.43%     
===========================================
  Files         127       27      -100     
  Lines       10051     1908     -8143     
===========================================
- Hits         6830      697     -6133     
+ Misses       3196     1186     -2010     
  Partials       25       25               

Impacted Files	Coverage Δ
client-sdk/go/modules/contracts/types.go	40.00% <ø> (ø)
client-sdk/go/types/transaction.go	53.93% <ø> (ø)
contract-sdk/src/abi/dispatch.rs
contract-sdk/src/testing.rs
contract-sdk/types/src/lib.rs
runtime-sdk-macros/src/method_handler_derive.rs
runtime-sdk/modules/contracts/src/abi/mod.rs
runtime-sdk/modules/contracts/src/abi/oasis/mod.rs
...untime-sdk/modules/contracts/src/abi/oasis/test.rs
runtime-sdk/modules/contracts/src/lib.rs
... and 92 more

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