fix: Minor logic and add unit tests for RNSUnified

[TuDo1403]

Description

This PR adds unit tests for RNSUnified.

Changes

• Add ERC721::exists check for RNSUnified::canSetRecord
• Fix ModifyingIndicator::hasAny function.
• Fix RNSUnified::setRecord.
• FIx event RecordUpdated emit many times / wrong data.
• Fix assembly error revert not work properly.

Test Coverage

Reproduce script:

forge coverage

Output

| File                                | % Lines          | % Statements     | % Branches     | % Funcs        |
|-------------------------------------|------------------|------------------|----------------|----------------|
| src/RNSToken.sol                    | 60.00% (9/15)    | 55.00% (11/20)   | 100.00% (0/0)  | 58.33% (7/12)  |
| src/RNSUnified.sol                  | 84.82% (95/112)  | 85.14% (126/148) | 85.42% (41/48) | 80.77% (21/26) |
| src/libraries/LibModifyingField.sol | 0.00% (0/1)      | 0.00% (0/2)      | 100.00% (0/0)  | 0.00% (0/1)    |
| src/libraries/math/LibSafeRange.sol | 100.00% (5/5)    | 80.00% (8/10)    | 66.67% (4/6)   | 100.00% (2/2)  |
| test/RNSUnified/RNSUnified.t.sol    | 0.00% (0/105)    | 0.00% (0/114)    | 0.00% (0/42)   | 0.00% (0/11)   |
| Total                               | 45.80% (109/238) | 49.32% (145/294) | 46.88% (45/96) | 57.69% (30/52) |

Checklist

• I have clearly commented on all the main functions following the NatSpec Format
• The box that allows repo maintainers to update this PR is checked
• I tested locally to make sure this feature/fix works

[ducthotran2010]

Lgtm