Fix: Add rounding for big number display (Issue #187)

[Natkuma01]

Description

Add a floor function with the condition that if the value is greater than 1000, round it up to a whole number; if it is less than 1000, do not make any changes.

Fixes #
Issue #187

#Before Fix

The values for District Steam Use and District Chilled Water Use are displayed with one decimal place, even if the number greater 1000.

#After Fix

Changes Made

1. on HistoricalBuildingDataTable.vue
   
   I noticed there are comments mentioning the need to round and process an optional float to a locale string, so I added that to the code. However, this refers to the Table, so please delete my code if this is not an issue.

2. on StatTile.vue
   
   This fixed the issue for the number format under District Steam Use and District Chilled Water Use

This is my first time making an open-source contribution. I'm happy to learn more if any part of this format is incorrect.

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[vkoves]

@Natkuma01 - this looks great, but could you make a separate function for the rounding and put it into common-functions.vue? That way we're not duplicating the < 1_000 check in several places. And the toLocaleString is correct, since it adds in the commas!

[vkoves]

Also @Natkuma01 how did you hear about this project? I'm surprised to get a random contributor, but we definitely appreciate the help! 🎉

[Natkuma01]

Hi @vkoves, sorry if this is a little awkward. I'm a CS college student. I found your issues on https://goodfirstissues.com/. Your project has a tag of "good first issue" and I'm new to open source projects; your issue seems like a good start and practice for me.

I refactored the code , add a function in common-functions.vue

I’m totally open to revisiting or refining the code as many times as needed. I have whole semester 🤗
Thanks for letting me practice.

[vkoves]

This looks great, thank you for the contribution!

[vkoves]

Small optional note, this comment is unnecessary because of the typing - since the function has the number return type, we know that it isn't returning a string.

[vkoves]

The linting is failing (I had to approve it running), but since this is a fork I'm just going to merge and I'll run yarn lint-fix on master. Thanks again for the contribution!