Remove negative coordinates

[davidfig]

• remove axes lines
• clamp viewport to start
• selection <-> excel-style coordinates
• remove 0 and negative values from sheet offsets
• show coordinates as A1 (with no options for the old coordinate style)
• new generic message from core to client
• new file version with shifted negative columns and rows
• replace coordinates in Validations
• replace coordinates in UI
• keyboard should navigate properly
• experiment with negative gray space again
• connections cell ref (merge and update w/A1)
• add errors to languages that highlight the lack of negative columns and rows
• python API changes
• JS API changes

Doc updates

• remove all negative and (0, 0) references from docs
• add page that describes why we moved away from (x, y) and negative offsets (include link in snackbar message)
• language docs updates
• upgrade all examples to 1.7.1 and ensure all cell references work properly
• ensure all snippets use new positioning

[qa-wolf]

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[vercel]

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Name	Status	Preview	Updated (UTC)
quadratic	✅ Ready (Inspect)	Visit Preview	Oct 4, 2024 0:17am

[codecov]

Codecov Report

Attention: Patch coverage is 94.48604% with 81 lines in your changes missing coverage. Please review.

Project coverage is 90.89%. Comparing base (cc8fde0) to head (ebe1b29).

Files with missing lines	Patch %	Lines
quadratic-core/src/sheet_offsets/mod.rs	60.00%	24 Missing ⚠️
quadratic-core/src/a1.rs	92.39%	14 Missing ⚠️
quadratic-core/src/grid/file/mod.rs	50.00%	14 Missing ⚠️
quadratic-core/src/selection/mod.rs	94.16%	8 Missing ⚠️
quadratic-core/src/selection/selection_to_a1.rs	97.47%	5 Missing ⚠️
...rc/controller/execution/run_code/run_connection.rs	98.72%	3 Missing ⚠️
...adratic-core/src/grid/sheet/formats/format_cell.rs	66.66%	3 Missing ⚠️
quadratic-core/src/selection/selection_from_a1.rs	98.14%	3 Missing ⚠️
...ratic-core/src/sheet_offsets/sheet_offsets_wasm.rs	0.00%	3 Missing ⚠️
...ratic-core/src/grid/file/shift_negative_offsets.rs	97.61%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##               qa    #1922      +/-   ##
==========================================
+ Coverage   90.76%   90.89%   +0.12%     
==========================================
  Files         247      253       +6     
  Lines       54593    55604    +1011     
==========================================
+ Hits        49553    50540     +987     
- Misses       5040     5064      +24     

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