feat(starknet): add support for maintenance mode

[ptisserand]

Description

Add support for maintenance mode, when executor is disabled, the following functions will revert:

• create_order
• cancel_order
• execute_order
• fulfill_order

Here is the interface for maintenance mode:

#[starknet::interface]
trait IMaintenance<T> {
    fn is_enabled(self: @T) -> bool;
    fn enable(ref self: T, enable: bool);
}

IMaintenance::enable can only be invoked by admin

What type of PR is this? (check all applicable)

• 🍕 Feature (feat:)
• 🐛 Bug Fix (fix:)
• 📝 Documentation Update (docs:)
• 🎨 Style (style:)
• 🧑‍💻 Code Refactor (refactor:)
• 🔥 Performance Improvements (perf:)
• ✅ Test (test:)
• 🤖 Build (build:)
• 🔁 CI (ci:)
• 📦 Chore (chore:)
• ⏩ Revert (revert:)
• 🚀 Breaking Changes (BREAKING CHANGE:)

Related Tickets & Documents

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

Added to documentation?

• 📜 README.md
• 📓 Documentation
• 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?

[optional] What gif best describes this PR or how it makes you feel?

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Latest commit: 0567cfb

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[linear]

DEV-720 Executor maintenance mode

[kwiss]

could we use a more descriptive function name here ? like set_maintenance_mode

[ptisserand]

Updated:

#[starknet::interface]
trait IMaintenance<T> {
    fn is_in_maintenance(self: @T) -> bool;
    fn set_maintenance_mode(ref self: T, on: bool);
}