feat: add "inline" directive

[pzerelles]

• Quick Checklist

• [x] I have read the contributing guidelines

• [x] I have written new tests, as applicable (for bug fixes / features)

• [x] Docs have been added / updated (for bug fixes / features)

• [x] I have added a changeset, if applicable

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) feature

• What is the new behavior (if this is a feature change)? images can be inlined with the inline directive

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) no

• Other information: fixes #253

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 126edda8f4b9506320f47bde6b30a2579e7fa361

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | vite-imagetools | Minor |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 93.64%. Comparing base (dc25e4b) to head (126edda).

Files	Patch %	Lines
packages/vite/src/index.ts	66.66%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #672 +/- ## ========================================== + Coverage 93.61% 93.64% +0.03% ========================================== Files 32 32 Lines 1190 1196 +6 Branches 190 193 +3 ========================================== + Hits 1114 1120 +6 Misses 76 76 ``` | [Flag](https://app.codecov.io/gh/JonasKruckenberg/imagetools/pull/672/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Kruckenberg) | Coverage Δ | | |---|---|---| | [imagetools-core](https://app.codecov.io/gh/JonasKruckenberg/imagetools/pull/672/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Kruckenberg) | `93.64% <66.66%> (+0.03%)` | :arrow_up: | | [vite-imagetools](https://app.codecov.io/gh/JonasKruckenberg/imagetools/pull/672/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Kruckenberg) | `93.64% <66.66%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Kruckenberg#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.