Prepare for 2024 edition

[a1akris]

Fix warnings

warning: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
(in the `futures` dependency)

warning: doc list item without indentation
  --> src/lib.rs:71:5
   |
71 | /// always use [`Limit::Pages`] in `*pages_ahead*` methods, otherwise `*pages_ahead*` streams will
   |     ^
   |
   = help: if this is supposed to be its own paragraph, add a blank line
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#doc_lazy_continuation
   = note: `#[warn(clippy::doc_lazy_continuation)]` on by default
help: indent this line

etc...

Improve documentation

• Fix grammar
• Simplify scheduling strategies descriptions
• Complete Add examples of tricky page-turner usages not mentioned in the docs #8

Implement optimizations

• Complete Implement more optimal scheduling for pages stream #5

Investigate features and changes in 2024 edition.

Index

Investigate if the following can improve or is required in the next release:

• Code replication via hacky macros to handle different combinations of Send/Sync bounds and variations of self types(mut, Arc, etc) is not contributor friendly and should be replaced with an idiomatic solution as soon as possible. TODO: Check out async trait/keyword generics features and add links if they are scheduled for 2024.
• https://blog.rust-lang.org/2024/09/05/impl-trait-capture-rules.html
• TODO