doc: #[near(contract_state)] in-depth pass

[dj8yfo]

• basic example: add impl block
• resolves doc: missing mentions in glossary of rustdoc of IterableMap, IterableSet #1283
• store: anchor for host-functions (env), used in impl
• store: add faq heading about flush+Drop
• collections: anchor for host-functions (env), used in impl
• resolves doc: #[near(contract_state)] doc should link to [store] and [collections] modules #1304
• resolves doc: #[near(contract_state)] subheading about implementation details + used host functions #1306
• abi workaround

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.33%. Comparing base (746e428) to head (1e7ea90).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1307   +/-   ##
=======================================
  Coverage   80.33%   80.33%           
=======================================
  Files         104      104           
  Lines       14829    14829           
=======================================
  Hits        11913    11913           
  Misses       2916     2916           

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[dj8yfo]

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[dj8yfo]

the back & forth adding/deleting base64ct pkg downgrade is due to this issue RustCrypto/formats#1684 , where it first bumped edition to 2024 in 1.7.0,
then it broke a lot of downstream builds, then 1.7.0 got yanked https://crates.io/crates/base64ct/versions,
and then it got cached with Swatinem/rust-cache (in Cargo.lock + /home/runner/.cargo/registry/cache ) 🤷‍♂️ in current pr,
despite not being present on crates.io any more.