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Merge pull request from GHSA-mgv8-gggw-mrg6
* fix: block storage allocator overflows the storage allocator did not guard against overflow when no storage layout override was provided. this could result in vulnerabilities like the following: ```vyper owner: public(address) buffer: public(uint256[max_value(uint256)]) @external def initialize(): self.owner = msg.sender @external def foo(idx: uint256, data: uint256): self.buffer[idx] = data ``` while the get_element_ptr calculation for `self.buffer[idx]` is checked, it is not checked in `mod_{2**256}` arithmetic, which can lead to arithmetic wrapping back to the `owner` variable if the provided `idx` is large enough. * clean up allocator logic also fix a bug where large allocations would use too much storage due to floating point rounding precision * add warning for large arrays * add note about 2**64 behavior
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