Implement binding rules for control statements

[ggiraldez]

This PR adds support in the binding rules for:

• if/else statements
• for loops
• while and do-while loops
• emit statements and basic event definitions
• try-catch statements
• revert and basic error definitions
• unchecked blocks

It also includes a reorganization of the rules file to improve readability and maintainability. Previously we were attempting to maintain compatibility with strict evaluation mode which meant that nodes and edges needed to be defined in previous rules. But since to build the stack graph the lazy evaluation mode is used anyway, this restriction can be dropped.

The file is now organized more or less hierarchically, with all the rules affecting a node and its descendants grouped together.

[changeset-bot]

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Latest commit: 635facd

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[OmarTawfik]

Left a few questions. Thanks!