fix(cdk:resizable): position should be set at start of resizing

[sallerli1]

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

1. 拖动开始的时候没有设置position，这期间如果元素的尺寸发生变化，之前记录的position并不会更新，如果仅仅点击边界不拖动，会让缩放异常进行
2. 只有在拖动的时候才设置resizing为true

What is the new behavior?

拖动开始的时候就设置position，并设置 resizing 为 true

Other information

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (96492f8) to head (a191a5d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1889   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files         359      359           
  Lines       35249    35249           
  Branches     2807     2808    +1     
=======================================
  Hits        32002    32002           
  Misses       3247     3247           

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