feat: change the type of price in item and add currency to item

[zhu-xiaowei]

Description

1. change the type of price in item
2. add attribute currency to item

General Checklist

• [x] Added new tests to cover change, if needed
• [ ] Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• [x] Documentation update for the change if required
• [x] PR title conforms to conventional commit style
• [ ] If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (813caa9) 100.00% compared to head (c1983e2) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #21 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 24 24 Lines 964 964 Branches 176 176 ========================================= Hits 964 964 ``` | [Files Changed](https://app.codecov.io/gh/awslabs/clickstream-web/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs) | Coverage Δ | | |---|---|---| | [src/types/Analytics.ts](https://app.codecov.io/gh/awslabs/clickstream-web/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs#diff-c3JjL3R5cGVzL0FuYWx5dGljcy50cw==) | `100.00% <ø> (ø)` | |

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