Make mocking async runtime agnostic

[j4r0u53k]

The runtime API is changed such that the TaskHandle is a Future which resolves to a Result both for smol and tokio.

[github-actions]

Code coverage report for 24cefb6

Coverage difference

❌ Code coverage worsened.

Filename	Stmts	Miss	Cover	Missing
src/runtime.rs	+3	+3	-13.33%	20, 21, 22
TOTAL	+3	+3	-0.12%

Overall coverage

Click to expand

Filename	Stmts	Miss	Cover	Missing
src/runtime.rs	18	6	66.67%	20-36
src/appnodes.rs	27	20	25.93%	74-154
src/client.rs	990	86	91.31%	107, 168-170, 188-190, 214-220, 241, 248, 311-313, 349-353, 374-379, 396, 411-429, 441-442, 452, 470-473, 490-502, 516, 533, 540-542, 581-586, 591, 598-601, 628, 640-642, 674, 712, 720, 726, 799, 1297, 1310-1313
src/connection.rs	183	85	53.55%	33-37, 65, 102, 106-119, 128, 149-154, 179-184, 192, 198-201, 215-221, 228-229, 238-242, 248-249, 259-302, 309
src/clientapi.rs	325	140	56.92%	48-53, 63-65, 71, 76, 94-138, 162-166, 185-191, 210-213, 219-225, 240-243, 265-267, 272, 276-279, 281, 296-297, 324-327, 332, 337, 347-348, 416-454, 470-473, 488-500, 520-522, 565-570, 578-581, 586-588
src/clientnode.rs	491	65	86.76%	31-35, 82-86, 93-97, 104, 111-112, 176-197, 335, 339, 344-351, 376-379, 416-422, 516-517, 525, 531-536, 678, 695, 789, 815, 859, 873
src/macros.rs	4	0	100.00%
TOTAL	2038	402	80.27%

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