add Line.bisectors

[smichr]

References to other Issues or PRs

closes #18358

Brief description of what is fixed or changed

Other comments

Release Notes

• geometry
  • Line.bisectors will return the two perpendicular lines, bisecting the angles at the intersection of two linear entities and laying in the same plane as them

[sympy-bot]

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• geometry
  • Line.bisectors will return the two perpendicular lines, bisecting the angles at the intersection of two linear entities and laying in the same plane as them (#19094 by @Jaime02 and @smichr)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.6.

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<!-- Your title above should be a short description of what
was changed. Do not include the issue number in the title. -->

#### References to other Issues or PRs
<!-- If this pull request fixes an issue, write "Fixes #NNNN" in that exact
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closes #18358
#### Brief description of what is fixed or changed


#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
* geometry
  * Line.bisectors will return the two perpendicular lines, bisecting the angles at the intersection of two linear entities and laying in the same plane as them
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #19094 into master will decrease coverage by 0.001%.
The diff coverage is 73.529%.

@@              Coverage Diff              @@
##            master    #19094       +/-   ##
=============================================
- Coverage   75.785%   75.784%   -0.002%     
=============================================
  Files          650       650               
  Lines       168909    168931       +22     
  Branches     39817     39822        +5     
=============================================
+ Hits        128009    128023       +14     
- Misses       35330     35333        +3     
- Partials      5570      5575        +5