feat(editor-document): add .properties getter, add .updateProperty method

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Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟢	Statements	99.24% (+4.83% 🔼)	394/397
🟢	Branches	95.1% (+4.01% 🔼)	97/102
🟢	Functions	98.2% (+7.46% 🔼)	109/111
🟢	Lines	99.2% (+4.87% 🔼)	370/373

Show files with reduced coverage 🔻

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St.^{:grey_question:}

| File | Statements | Branches | Functions | Lines | | :----------------------------------------------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------- | :--------- | :------------------------------------------------------------ | :-------- | :---- | | 🟢 |

`...` / index.ts

| 100% |

83.33% (-16.67% 🔻)

| 100% | 100% |

Test suite run success

149 tests passing in 10 suites.

Report generated by 🧪jest coverage report action from 5a5a5fb2b0e6b282fe5327590ce23d578dd1ebbf