fix(): restore js extension for the website fabricjs.com

[asturur]

This is the simplest way to restore the website npm start command
Other points around removal of cjs extension is that probably the only bundle we will have is the umd.js + sourcemaps, and the rest can stay as unbundled files.

I don't think this needs more discussions till we have time to finish that other build playground i have in the other PR that for now is parked as not time for it. When that PR is ready we can re-review the names.

[github-actions]

Build Stats

file / KB (diff)	bundled	minified
fabric	892.364 (0)	304.113 (0)

[github-actions]

Coverage after merging restore-npm-start-functionalities into master will be

83.03%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
fabric.ts	100%	100%	100%	100%
index.node.ts	7.69%	100%	0%	14.29%	18, 21, 24, 30, 33, 36
src
Collection.ts	95.65%	95%	89.66%	97.83%	205–206, 231–232
CommonMethods.ts	100%	100%	100%	100%
Intersection.ts	100%	100%	100%	100%
Observable.ts	87.23%	85.29%	84.62%	89.36%	144–145, 170–171, 39–40, 48, 57, 91, 99
Pattern.ts	95.77%	94.29%	100%	96.43%	124, 135, 144
Point.ts	100%	100%	100%	100%
Shadow.ts	98.48%	96%	100%	100%	156
cache.ts	97.06%	90%	100%	100%	56
config.ts	75%	64.29%	66.67%	82.76%	138, 138, 138, 138, 138–140, 151–153
constants.ts	100%	100%	100%	100%
typedefs.ts	100%	100%	100%	100%
src/brushes
BaseBrush.ts	100%	100%	100%	100%
CircleBrush.ts	0%	0%	0%	0%	100, 102–104, 113, 113, 113, 115, 117, 119–121, 123–126, 133–134, 141, 143, 28–29, 37–41, 45–49, 56–59, 67–71, 73, 81, 81, 81, 81, 81–82, 84, 84, 84–87, 89, 97–98
PatternBrush.ts	97.06%	87.50%	100%	100%	21
PencilBrush.ts	91.01%	82.35%	100%	93.75%	122–123, 152, 152–154, 176, 176, 276, 280, 285–286, 68–69, 84–85
SprayBrush.ts	0%	0%	0%	0%	100–101, 103–104, 112, 112, 112, 112, 112–113, 115–116, 123–124, 126, 128–132, 141, 145–146, 146, 154, 154, 154–157, 159–162, 166–167, 169, 171–174, 177, 184–185, 187, 189–190, 192, 199–200, 202–203, 206, 206, 213, 213, 217, 22–23, 25–27, 27, 27–29, 33, 42, 49, 56, 63, 70, 89–91, 99
src/canvas
Canvas.ts	78.91%	77.01%	83.08%	79.65%	1009–1010, 1010, 1010–1012, 1014–1015, 1015, 1015, 1017, 1025, 1025, 1025–1027, 1027, 1027, 1033–1034, 1042–1043, 1043, 1043–1044, 1049, 1051, 1082–1084, 1087–1088, 1092–1093, 1210–1212, 1215–1216, 1289, 1409, 1503–1504, 1510, 1514–1515, 1531, 1553, 1600, 1605, 1653, 171, 196, 305–306, 309–313, 318, 341–342, 347–352, 372, 372, 372–373, 373, 373–374, 38, 382, 387–388, 388, 388–389, 391, 400, 406–407, 407, 407, 42, 450, 458, 462, 462, 462–463, 465, 547–548, 548, 548–549, 555, 555, 555–557, 577, 579, 579, 579–580, 580, 580, 583, 583, 583–584, 587, 596–597, 599–600, 602, 602–603, 605–606, 618–619, 619, 619–620, 622–626, 632, 639, 679, 679, 679, 681, 683–687, 693, 699, 699, 699–700, 702, 705, 710, 723, 750, 750, 808–809, 809, 809–810, 812, 815–816, 816, 816–817, 819–820, 823, 823–825, 828–829, 899, 911, 918, 939, 971, 992–993
SelectableCanvas.ts	93.82%	90.71%	94.12%	96.11%	1133, 1133–1134, 1137, 1157, 1157, 1216, 1266–1267, 1288, 1296, 1409–1410, 1412–1413, 1433–1434, 552–553, 558, 568, 701–702, 704–705, 705, 705, 751–752, 813–814, 867–869, 899, 904–905, 934–935
StaticCanvas.ts	95.96%	91.29%	100%	97.92%	1083–1084, 1084, 1084–1085, 1205, 1215, 1269–1270, 1273, 1308–1309, 1386, 1395, 1395, 1399, 1399, 1446–1447, 1661–1662, 282–283, 300, 380–381, 383–384, 745, 757–758, 843
TextEditingManager.ts	100%	100%	100%	100%
src/color
Color.ts	92.16%	86.49%	100%	94.29%	330–331, 335–336, 339–340, 58, 88–89, 89, 91, 91, 91–92, 94–95
color_map.ts	100%	100%	100%	100%
constants.ts	100%	100%	100%	100%
util.ts	100%	100%	100%	100%
src/controls
Control.ts	93.90%	88.89%	90.91%	97.73%	235, 319, 319, 354
changeWidth.ts	100%	100%	100%	100%
controls.render.ts	81.63%	78%	100%	84.78%	106, 111, 121, 121, 45, 50, 61, 61, 65–72, 81–82
default_controls.ts	86.67%	66.67%	100%	100%	122, 129
drag.ts	100%	100%	100%	100%
polyControl.ts	6.15%	0%	0%	11.11%	100, 105, 119, 119, 119, 121–124, 124, 127, 134, 17, 25–28, 30, 30, 30, 30, 30, 30, 30, 30, 50–56, 56, 56, 56, 56, 58, 63–64, 66, 76, 82–83, 83, 83–84, 88–90, 90, 90, 90, 90, 92
rotate.ts	19.57%	12.50%	50%	21.43%	41, 45, 51, 51, 51–52, 55–57, 59, 59, 59, 59, 59–61, 61, 61–63, 65, 65, 65–67, 67, 67–68, 73, 73, 73–74, 76, 78, 80–81
scale.ts	93.49%	92.77%	100%	93.67%	129–130, 132–134, 148–149, 181–183, 42
scaleSkew.ts	78.79%	64.29%	100%	85.71%	27, 29, 29, 29, 31, 33, 35
skew.ts	91.03%	79.31%	100%	97.67%	130–131, 162–163, 170, 176, 178
util.ts	100%	100%	100%	100%
wrapWithFireEvent.ts	100%	100%	100%	100%
wrapWithFixedAnchor.ts	100%	100%	100%	100%
src/env
browser.ts	84.21%	77.78%	50%	100%	14, 17
index.ts	93.75%	50%	100%	100%	20
node.ts	76.92%	50%	66.67%	88.24%	27, 31–32, 32, 32
src/filters
BaseFilter.ts	19.77%	20%	30%	17.65%	100–101, 101, 101–102, 109–112, 112, 112–113, 119, 119, 119–122,