api: allow creation of a register with optional value #10680

Job	Run time
build	6s
Unused dependency check	7m 40s
various checks	14m 29s
lint	23s
Network churning tests (ubuntu-latest, /home/runner/.local/share/autonomi/node, /home/runner/.loc...	18m 19s
Network churning tests (windows-latest, C:\\Users\\runneradmin\\AppData\\Roaming\\autonomi\\node,...	26m 24s
Network churning tests (macos-latest, /Users/runner/Library/Application Support/autonomi/node, /U...	17m 9s
E2E tests (ubuntu-latest, /home/runner/.local/share/autonomi)	12m 56s
Large file upload	3m 23s
E2E tests (windows-latest, C:\\Users\\runneradmin\\AppData\\Roaming\\autonomi)	39m 4s
E2E tests (macos-latest, /Users/runner/Library/Application\ Support/autonomi)	13m 0s
Unit Tests (ubuntu-latest)	4m 32s
Unit Tests (windows-latest)	24m 36s
Verify data location and Routing Table (ubuntu-latest, /home/runner/.local/share/autonomi/node, /...	20m 36s
Unit Tests (macos-latest)	4m 30s
Verify data location and Routing Table (windows-latest, C:\\Users\\runneradmin\\AppData\\Roaming\...	33m 8s
Verify data location and Routing Table (macos-latest, /Users/runner/Library/Application Support/a...	19m 22s
	4h 19m 37s

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