evm/kernel: initialize datastructure of the delayed inbox

Context

Under the hood, the delayed inbox will use a linked list as described in this document: https://docs.google.com/document/d/1u5U1_nQnrsJGDGBRV6w-U7Pf8uXPzu-tD3-AUErSJig/edit#heading=h.hwvonqcrff4o

The goal of the linked list is to provide basic primitive over the linked list:

• empty/constuctor: to create a linked list !11107 (merged)
• push: to push an element at the end of the list: !11108 (merged)
• get: to retrieve an element from the list: !11108 (merged)
• remove: to remove an element at any position of the list !11109 (merged)
• front: to retrieve the first element of the list !11110 (merged)
• pop: to remove the first element of the list !11111 (merged)

The different features are splitted into small MR. This MR is the initialization, it initializes the datastructure of the list.

Manually testing the MR

cd src/kernel_evm && make build && make check && make test

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR