Arbitrary implementations for sov-schema-db & sov-sequencer-registry

[neysofu]

Description

Implements Arbitrary for sov_sequencer_registry::CallMessage and sov_schema_db::{WriteOp, SchemaBatch}.

Linked Issues

Related to #438.

[codecov]

Codecov Report

Merging #1094 (7da46fc) into nightly (a478f40) will decrease coverage by 0.2%.
Report is 6 commits behind head on nightly.
The diff coverage is 0.0%.

Files	Coverage Δ
full-node/db/sov-schema-db/src/schema.rs	0.0% <ø> (ø)
...implementations/sov-sequencer-registry/src/call.rs	87.2% <ø> (ø)
full-node/db/sov-schema-db/src/lib.rs	88.6% <0.0%> (ø)

... and 15 files with indirect coverage changes