Add "Show all regions in assembly" to import form and make import form show entire region when refName selected

[cmdcolin]

This is a proposal for a couple more navigation features in the lgv

• "Show all regions in assembly" button on importform
• "Return to import form" view menu item
• Add showAllRegions after importform navigation. This causes, for example, if LGV refName chr1 is selected, that the entire chr1 is put into view instead of a small window from chr1:1-1000 that we see currently

[cmdcolin]

screenshot of the new import form

[codecov]

Codecov Report

Merging #1704 (0e9e25d) into master (734e00a) will decrease coverage by 0.01%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master    #1704      +/-   ##
==========================================
- Coverage   58.89%   58.88%   -0.02%     
==========================================
  Files         446      446              
  Lines       20468    20475       +7     
  Branches     4824     4824              
==========================================
+ Hits        12055    12056       +1     
- Misses       8115     8121       +6     
  Partials      298      298              

Impacted Files	Coverage Δ
...s/linear-genome-view/src/LinearGenomeView/index.ts	83.84% <0.00%> (-0.61%)	⬇️
...iew/src/LinearGenomeView/components/ImportForm.tsx	74.54% <33.33%> (-2.38%)	⬇️

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[rbuels]

you know, I was thinking about this again just now, and it seems to me that "show all regions" would make more sense as stateful slider switch between "show first region / show all regions" than as a separate button. With the current button, it's a little confusing to the user whether the "show all regions" button does the same thing as "open", or what

[cmdcolin]

Does this need reopening? I'm open to a design review, but I don't really think a slider switch is my preferred design