feat(icon): add go-lang folder icon

[SayanShankhari]

Add open and close folder icon for go programming language.

Resolves: #3362

@zguydev, thanks for raising the issue.

Description

Take official go lang branding exact G and O design having gopher color (#00ADD8).
Create the 3 motion lines to custom half pixel height (1 pixel feels huge and looses genuineness) and imitate close to the original design.
Use material design color converter to convert and pick suitable color pair that are close to original design and have good contrast between background (#0091EA) and foreground (#84FFFF). The foreground color is lighter but closer to one of the original brand recommended colors, light blue (#5DC9E2).

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[SayanShankhari]

@PKief, @lucas-labs, please suggest if any changes to be made.

[PKief]

@SayanShankhari thanks for reaching out. I'm pretty sure that the motive color is not in the same column as the color of the folder by looking at the icon.

Can you choose the colors from the same column from our color grid?
https://pkief.github.io/material-color-converter/

[SayanShankhari]

tried out some color combinations as below,

1. folder: #00B8D4 (maps to real gopher blue #00ADD8); motive: #84FFFF (same column 4th lightest)
2. folder: #00ACC1 (upper column, almost same as above); motive: #84FFFF (same as above, as going lighter will make it invisible in light theme)
3. folder: #0097A7 (darker); motive: #84FFFF (same as above)
4. folder: #00838F (more darker); motive: #84FFFF (same as above)

Please suggest which one looks fine to you.

[zguydev]

My favorite is doing as close to the gopher blue as possible (1.)

[SayanShankhari]

ok, @zguydev, going with 1st one, thanks for letting know.

[SayanShankhari]

@PKief, please review this.