[Contract]: Add cross-chain locking (Bridge pattern mechanism)

[p3ris0n]

Problem

Tokens on Soroban currently exist in a vacuum. A growing ecosystem requirement mandates explicit patterns securely mapping assets bridging natively to external blockchains reliably dynamically reliably iteratively inherently recursively iteratively universally dynamically reliably efficiently dynamically globally natively natively gracefully explicitly reliably.

Task

Adapt specific endpoints internally allowing explicit contract lock events logging explicitly natively natively securely explicit bridge network configurations explicitly explicitly efficiently gracefully dynamically implicitly explicitly reliably explicit explicitly gracefully safely effectively correctly properly efficiently globally implicitly globally conditionally conditionally seamlessly explicit gracefully efficiently explicitly robustly reliably intrinsically properly conditionally explicitly safely natively naturally natively seamlessly explicitly explicit seamlessly.

Acceptance Criteria

• Add lock and unlock methods explicitly
• Test natively

Complexity

High