[WIP] Improving formatting of valid chemical formulae

[ml-evs]

For now, this PR simply starts listing some rules on chemical formulae formatting that we can follow eventually, e.g.:

    chemFormulaFormat() {
      // Need to capture several groups, if the overall format doesn't apply, then
      // there should be no additional formatting whatsoever
      //
      // Some rules:
      //
      // * numbers between element symbols need to be subscripted, including "." and variables like "x"
      //    - e.g., Na3P => Na<sub>3</sub>P, Na3+xP => Na<sub>3+x</sub>P
      // * charges need to be handled separately and superscripted
      //    - e.g., Na+Cl- => Na<sup>+</sup>Cl<sup>-</sup>
      // * empirical labels for formula units like [pyr] must be left alone
      // * dots, when not used within numbers, must be treated as an interpunct "dot product" style dot
      //     - e.g., Cu2SO4.H2O => Cu<sub>2</sub>SO<sub>4</sub> · H<sub>2</sub>O

I think many of these can be handled selectively with some judicious regexes, and beyond formatting, the same rules could be used to validate e.g., empirical formulae in JS used for computing yields and the like.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.28%. Comparing base (c80ea21) to head (b386ed4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1121   +/-   ##
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  Coverage   70.28%   70.28%           
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  Files          63       63           
  Lines        4133     4133           
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  Hits         2905     2905           
  Misses       1228     1228           

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[cypress]

datalab    Run #3102

Run Properties:   Failed #3102  •  71b95bb36e ℹ️: Merge b386ed46e624a5d7e3582628c262114b72ccd319 into c80ea21160faab435a06b3675b6d...

Project	datalab
Branch Review	ml-evs/chemform
Run status	Failed #3102
Run duration	04m 51s
Commit	71b95bb36e ℹ️: Merge b386ed46e624a5d7e3582628c262114b72ccd319 into c80ea21160faab435a06b3675b6d...
Committer	Matthew Evans
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Test results
Failures	3
Flaky	0
Pending	0
Skipped	0
Passing	144
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Tests for review

  cypress/e2e/editPage.cy.js • 1 failed test • End-to-end tests (firefox)

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Test		Artifacts
Edit Page > Checks editing the sample edit page		Screenshots

  cypress/e2e/editPage.cy.js • 1 failed test • End-to-end tests (chrome)

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Test		Artifacts
Edit Page > Checks editing the sample edit page		Test Replay Screenshots

  cypress/e2e/editPage.cy.js • 1 failed test • End-to-end tests (electron)

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Test		Artifacts
Edit Page > Checks editing the sample edit page		Test Replay Screenshots