Svelte: Add basic telemetry to svelte implementation

[vovakulikov]

Closes #61635

Context

This PR moves the telemetry events out of the web package to the shared package. This allows using this telemetry service in the web-sveltekit package. Also, the wrapper over the original telemetry adds a special isSveltePrototype: true parameter to make a difference later between the original event and the svelte events.

Second thing, this PR adds only a subset of the original event; if you see that some event is missing, please leave a note. Currently, this adds these events

    ViewHomePage = 'Home',
    ViewSearchResultsPage = 'SearchResults',
    ViewRepositoryPage = 'Repository',
    ViewBlobPage = 'Blob',

    SearchSubmit = 'SearchSubmitted',
    SearchResultClick = 'SearchResultClicked',
    ShowHistoryPanel = 'ShowHistoryPanel',
    HideHistoryPanel = 'HideHistoryPanel',
    CodeCopied = 'CodeCopied',
    GoToCodeHost = 'GoToCodeHostClicked',
    GitBlameEnabled = 'GitBlameEnabled',
    SelectSearchFilter = 'SearchFiltersSelectFilter',

For reviewers

Diff got a lot of files due to the telemetry service moving. Check the commit history for easier review.

Next steps

Note that this PR uses old telemetry V1 due to needs around migration amplitude dashboards to new v2 telemetry events. I have a follow up here and I aim to bring new telemetry in June release #62191

Test plan

• Manually check that page view event and action-based event send actual telemetry events

[sourcegraph-bot]

📖 Storybook live preview

[camdencheek]

Should this be part of the context rather than a global?

[vovakulikov]

I was thinking about this but then I couldn't come up with reasons why it shouldn't be a global singleton. There might be an argument that this could be better for mocking in tests but I can say that there are no big differences in vi.mock vs context mocking, curious about what @fkling thinks

[camdencheek]

We should really get our formatters all in sync 😄

[vovakulikov]

To make sure we have time to test it on staging and with amplitude I'm going ahead and merging this, will be happy to change anything later next week if something shows up