Add devcontainer support to repo #254

Job	Run time
Create Packages	20s
Lint	48s
Smoke Tests (pygls) (ubuntu-latest, 3.7)	43s
Smoke Tests (pygls) (ubuntu-latest, 3.8)	38s
Smoke Tests (pygls) (ubuntu-latest, 3.9)	35s
Smoke Tests (pygls) (ubuntu-latest, 3.10)	40s
Smoke Tests (pygls) (ubuntu-latest, 3.11)	30s
Smoke Tests (pygls) (windows-latest, 3.7)	1m 17s
Smoke Tests (pygls) (windows-latest, 3.8)	1m 31s
Smoke Tests (pygls) (windows-latest, 3.9)	1m 6s
Smoke Tests (pygls) (windows-latest, 3.10)	1m 10s
Smoke Tests (pygls) (windows-latest, 3.11)	1m 24s
Tests (ubuntu-latest, 3.7)	19s
Tests (ubuntu-latest, 3.8)	18s
Tests (ubuntu-latest, 3.9)	18s
Tests (ubuntu-latest, 3.10)	21s
Tests (ubuntu-latest, 3.11)	14s
Tests (windows-latest, 3.7)	55s
Tests (windows-latest, 3.8)	44s
Tests (windows-latest, 3.9)	46s
Tests (windows-latest, 3.10)	49s
Tests (windows-latest, 3.11)	40s
	16m 6s

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