refactor(finite_automata): Update RegisterHandler API for the initial simulation implementation:

[SharafMohamed]

• Add new registers to the prefix tree root.
• Add get_num_regs API to report the register count.
• Remove unused set_register API.

Description

Fix:

• Previously each register creation would either: create a new root, or point to an existing register as a parent. This flow of setting up registers isn't useful for the way simulation works.
• Instead, we now only create a single root and each new register always points to this root. Then when a register needs to be updated, we append positions to the prefix tree, and have the register to point to the new node in the prefix tree. This is the only operation needed for functionality.
• In the first implementation of simulation, we store all information in the prefix tree, this means the set functionality isn't needed, so it is also removed. In an already prepared future PR, we reintroduce the idea of separating single-valued registers and multi-valued registers for efficiency, however this is more involved and doesn't use the existing set function anyway.

New Addition

• We will need a way to know the number of registers. To do this we add get_num_regs().

Validation performed

Updated register tests pass.

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[SharafMohamed]

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