[documentation] #2544: Tutorial doctests

[appetrosyan]

Signed-off-by: 6r1d [email protected]

Description of the Change

Adds example that mirrors tutorial examples, so that changes in the API can be propagated by directly taking them from GitHub.

Issue

Addresses #2544

Benefits

Direct connection to tutorial

Possible Drawbacks

More code to test

Usage Examples or Tests [optional]

cargo run --example tutorial

Alternate Designs [optional]

As test

[codecov[bot]]

Codecov Report

Merging #2603 (5b0264d) into iroha2-dev (a16d9c3) will decrease coverage by 2.06%. The diff coverage is 65.23%.

:exclamation: Current head 5b0264d differs from pull request most recent head 4275583. Consider uploading reports for the commit 4275583 to get more accurate results

@@              Coverage Diff               @@
##           iroha2-dev    #2603      +/-   ##
==============================================
- Coverage       67.61%   65.55%   -2.07%     
==============================================
  Files             140      156      +16     
  Lines           26173    28212    +2039     
==============================================
+ Hits            17696    18493     +797     
- Misses           8477     9719    +1242     

Impacted Files	Coverage Δ
cli/derive/src/lib.rs	74.72% <ø> (ø)
cli/src/torii/mod.rs	28.88% <ø> (ø)
cli/src/torii/routing.rs	69.92% <0.00%> (-2.87%)	:arrow_down:
client/src/http.rs	47.82% <ø> (ø)
client_cli/src/main.rs	0.26% <ø> (ø)
config/base/src/runtime_upgrades.rs	35.63% <ø> (ø)
core/src/block.rs	70.00% <ø> (ø)
core/src/queue.rs	95.67% <ø> (-0.08%)	:arrow_down:
core/src/smartcontracts/isi/asset.rs	54.82% <ø> (ø)
core/src/sumeragi/message.rs	8.20% <0.00%> (ø)
... and 161 more

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[6r1d]

TO-DOs:

• [x] Add a deprecation warning (#[deprecated]) into http.rs's new, since it is being superseded by try_new.
• [x] #[must_use] is redundant for try_new.
• [ ] There's some code that should be added to the examples

[6r1d]

Documentation check currently stops, because it sees the ^ character, caused by the example warning:

if cargo doc -q 2>&1 | grep '^'; then exit 1; fi

My first attempt at fixing the code failed, but I'll try more.

[6r1d]

I have to extend expect with actual error messages.