fix(contracts): OZ-L03 Inconsistency of Allowing a Trusted Forwarder

[zimpha]

Purpose or design rationale of this PR

This PR partially fixed the issue reported by Openzepplin (L-03 Inconsistency of Allowing a Trusted Forwarder). The following are the details:

In GasSwap, some parts of the code rely on _msgSender and others on msg.sender. This inconsistency can lead to confusion as to when meta-transactions are allowed. For example, GasSwap inherits from OwnableBase which has an onlyOwner check that uses msg.sender. Therefore, all functions with onlyOwner modifier will fail when submitted through a trusted forwarder.

This inconsistency is confusing and error-prone. Consider using _msgSender() everywhere in GasSwap and OwnableBase, which will automatically default to msg.sender if it is not sent from the trustedForwarder address.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• fix: A bug fix

Deployment tag versioning

Has tag in common/version.go been updated?

• No, this PR doesn't involve a new deployment, git tag, docker image tag
• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

[github-actions]

LCOV of commit adae0f2 during Contracts #52

Summary coverage rate:
  lines......: 51.6% (1013 of 1965 lines)
  functions..: 65.2% (227 of 348 functions)
  branches...: no data found

Files changed coverage rate: n/a