[Lang] [refactor] Deprecate x.shape() and x.dim(), use x.shape instead

[archibate]

Related issue = #1214 (comment)

[Click here for the format server]

---

• deprecate dim().
• make shape() a @property.
• document mat.n, mat.m in meta.rst.

Will we make data_type() and snode() as a @property as well?

[codecov]

Codecov Report

Merging #1318 into master will increase coverage by 0.04%.
The diff coverage is 91.42%.

@@            Coverage Diff             @@
##           master    #1318      +/-   ##
==========================================
+ Coverage   85.48%   85.52%   +0.04%     
==========================================
  Files          19       19              
  Lines        3375     3385      +10     
  Branches      630      630              
==========================================
+ Hits         2885     2895      +10     
  Misses        358      358              
  Partials      132      132              

Impacted Files	Coverage Δ
python/taichi/lang/transformer.py	93.63% <ø> (ø)
python/taichi/lang/matrix.py	90.70% <88.88%> (+0.03%)	⬆️
python/taichi/lang/expr.py	89.82% <91.66%> (ø)
python/taichi/lang/snode.py	87.12% <92.85%> (+1.10%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0a434d3...7237812. Read the comment docs.

[k-ye]

LGTM. Do you know if there are examples using shape() or dim()?

[archibate]

LGTM. Do you know if there are examples using shape() or dim()?

I grep'ed to find them out, all are removed now, thank for the reminder!

[yuanming-hu]

Very nice. Thanks!

Will we make data_type() and snode() as a @property as well?

Let's talk about it later. data_type may be changed into dtype: #1181.