feat(units): updated unit transfer method and created integration tests

[bitbeckers]

• Updated transfer_units_batch method to prevent double accounting of units
• Init integration test for ValueTransfer
• Init integration test for UnitTransfer
• Closes Units for fractions are incorrect #98
• Closes Claims created with incorrect token IDs #101
• Closes Storing unit transfer results in conflict on existing token #96
• Works on [Indexer] Create integration tests #60

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔴	Lines	Unknown% (🎯 55%)	0 / 0
🔴	Statements	Unknown% (🎯 55%)	0 / 0
🔴	Functions	Unknown% (🎯 55%)	0 / 0
🔴	Branches	Unknown% (🎯 55%)	0 / 0

File Coverage

No changed files found.

Generated in workflow #31