examples: Migrate code snippets from .md files to separate sources

[matevz]

Implements #1026:

• migrates code snippets from hardcoded .md files to separate projects in examples/contract-sdk, examples/runtime-sdk and examples/client-sdk/go folders
• bumps rust-toolchain for contract-sdk and runtime-sdk examples to 2022-08-06
• removes strip feature from Cargo.toml since it's already included in rust 1.58 onwards by default
• adds building, testing and linting of examples to CI
• fixes typo manfiest -> manifest in github workflows, cliipy -> clippy

[codecov]

Codecov Report

Merging #1125 (a577d92) into main (e18a28e) will decrease coverage by 40.88%.
The diff coverage is n/a.

❗ Current head a577d92 differs from pull request most recent head 867b31c. Consider uploading reports for the commit 867b31c to get more accurate results

@@             Coverage Diff             @@
##             main    #1125       +/-   ##
===========================================
- Coverage   67.81%   26.93%   -40.89%     
===========================================
  Files         131       26      -105     
  Lines       11575     1916     -9659     
===========================================
- Hits         7850      516     -7334     
+ Misses       3693     1368     -2325     
  Partials       32       32               

Impacted Files	Coverage Δ
...untime-sdk/src/modules/consensus_accounts/types.rs
runtime-sdk/modules/contracts/src/abi/mod.rs
contract-sdk/types/src/token.rs
runtime-sdk/src/modules/core/mod.rs
contract-sdk/specs/token/oas20/src/types.rs
contract-sdk/src/error.rs
runtime-sdk/src/testing/keys.rs
runtime-sdk/src/runtime.rs
runtime-sdk/src/testing/mock.rs
runtime-sdk/src/storage/typed.rs
... and 95 more

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[pro-wh]

oh that's a nice way to do it, thanks