Redesign `goblin::elf::dynamic::DynamicInfo` to expose the optionality of `DT_JMPREL`

In ELF, the DT_JMPREL dynamic array tag is optional, and can be present (holding an address value) or absent. The value of that tag is exposed as goblin::elf::dynamic::DynamicInfo.jmprel, which is of type usize. DynamicInfo.jmprel is set to zero if DT_JMPREL is absent from the ELF file.

Therefore, based on the definition of goblin::elf::dynamic::DynamicInfo, there is no way to differentiate the absence of DT_JMPREL from its presence with the value zero, because zero can be a valid address, especially in privileged mode and in embedded systems.

I think DT_JMPREL should be exposed by DynamicInfo as optional information. We should make the type of DynamicInfo.jmprel an Option<usize> instead.

Start by locating the definition of goblin:🧝:dynamic::DynamicInfo and searching for uses of its jmprel field. Check the ELF dynamic parsing path and affected callers; done means the field exposes whether DT_JMPREL is absent or present even when its address is zero, with affected tests or callers updated accordingly.