doc: examples for Near-related host functions

[denbite]

Make it straightforward for developers how host functions can be imported and used

The final markdown doc page will appear as follows

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.16%. Comparing base (22f3500) to head (90b43a7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1259   +/-   ##
=======================================
  Coverage   80.16%   80.16%           
=======================================
  Files         102      102           
  Lines       14598    14598           
=======================================
  Hits        11703    11703           
  Misses       2895     2895           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dj8yfo]

@denbite please fix compilation errors. There's at least one, where NearToken::from_yocto is used instead of NearToken::from_yoctonear

[denbite]

@dj8yfo done, please review

[denbite]

@dj8yfo also just added a little text about the purpose of functions like storage_write, storage_read, etc, with a reference to the real-life example
must be helpful for devs to understand that these methods are typically used to upgrade/migrate state of a contract

[dj8yfo]

@race-of-sloths score 13

[race-of-sloths]

@denbite Thank you for your contribution! Your pull request is now a part of the Race of Sloths!
Weekly streak is on the road, smart strategy! Secure your streak with another PR!

Current status: executed

Reviewer	Score
@dj8yfo	13

Your contribution is much appreciated with a final score of 13!
You have received 155 (130 base + 15 weekly bonus + 10 monthly bonus) Sloth points for this contribution

@dj8yfo received 25 Sloth Points for reviewing and scoring this pull request.

Congratulations @denbite! Your PR was highly scored and you completed another monthly streak! To keep your monthly streak make another pull request next month and get 8+ score for it

What is the Race of Sloths

Race of Sloths is a friendly competition where you can participate in challenges and compete with other open-source contributors within your normal workflow

For contributors:

• Tag @race-of-sloths inside your pull requests
• Wait for the maintainer to review and score your pull request
• Check out your position in the Leaderboard
• Keep weekly and monthly streaks to reach higher positions
• Boast your contributions with a dynamic picture of your Profile

For maintainers:

• Score pull requests that participate in the Race of Sloths and receive a reward
• Engage contributors with fair scoring and fast responses so they keep their streaks
• Promote the Race to the point where the Race starts promoting you
• Grow the community of your contributors

Feel free to check our website for additional details!

Bot commands

• For contributors
  • Include a PR: @race-of-sloths include to enter the Race with your PR
• For maintainers:
  • Invite contributor @race-of-sloths invite to invite the contributor to participate in a race or include it, if it's already a runner.
  • Assign points: @race-of-sloths score [1/2/3/5/8/13] to award points based on your assessment.
  • Reject this PR: @race-of-sloths exclude to send this PR back to the drawing board.
  • Exclude repo: @race-of-sloths pause to stop bot activity in this repo until @race-of-sloths unpause command is called

[dj8yfo]

@denbite it felt somewhat overwhelming to request changes for all found suggestions
with current pr not introducing anything particularly erroneous,

so i'll extract those to an issue in case someone volunteers to further improve docs by adding links