add angle parameter to ring component

[simbilod]

parameter to control angle coverage of a ring

@mdecea

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 3.08%.

Quality metrics	Before	After	Change
Complexity	0.18 ⭐	0.18 ⭐	0.00
Method Length	65.33 🙂	68.00 🙂	2.67 👎
Working memory	9.41 🙂	11.06 😞	1.65 👎
Quality	68.42% 🙂	65.34% 🙂	-3.08% 👎

Other metrics	Before	After	Change
Lines	39	41	2

Changed files	Quality Before	Quality After	Quality Change
gdsfactory/components/ring.py	68.42% 🙂	65.34% 🙂	-3.08% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
gdsfactory/components/ring.py	ring	0 ⭐	142 😞	13 😞	58.59% 🙂	Try splitting into smaller methods. Extract out complex expressions

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