EAM API: change AppManifest version to string

[gainsley]

What type of PR is this?

• correction

What this PR does / why we need it:

Change AppManifest version from int to string, to allow version to be in semver format, i.e. "1.0.1", or like a docker tag, i.e. "latest" or "stable-1.0", or an integer as it was originally. Basically requiring it to an integer is too limiting.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Changelog input

change AppManifest version field type from integer to string

Additional documentation

docs

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	2		0	0.02s
✅ JSON	eslint-plugin-jsonc	1	0	0	1.3s
✅ JSON	jsonlint	1		0	0.17s
✅ JSON	prettier	1	1	0	0.97s
✅ JSON	v8r	1		0	2.39s
✅ OPENAPI	spectral	3		0	6.1s
✅ REPOSITORY	git_diff	yes		no	0.5s
✅ REPOSITORY	secretlint	yes		no	4.66s
✅ YAML	yamllint	3		0	0.8s

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