[Feature] Move alloc feature behind a feature gate

Component

primitives

Describe the feature you would like

I've checked the codebase, and two types that are used from the alloc crate are String and vec.

There is a possibility to move remove the alloc dependency from the crate. The only type that will be disabled by that is Bytes - but all Uxxx and Ixxx math, Address type and others will remain.

There is a bunch of formatting that use String here and there, but it all can be replaced with on-stack buffers (stack-based arrayvec::ArrayString can be used instead), because for all those cases we either know the exact buffer size of at least the maximum possible string size.

I think is reasonable to assume that primitive_types can work without the alloc, hence this issue. I can work on an implementation if this is something you consider to be accepted.

Additional context

No response