[Feature] Carry params by key-value in SphU.entry() | 参数埋点支持以 key-value 的方式传入参数

## Issue Description

Type: *feature request*

### Describe what feature you want

Support carrying params by key-value in `SphU.entry()`. An example:

```java
Map argMap = new HashMap();
argMap.put("key1", "value1");
argMap.put("key2", "value2");

SphU.entry("my-resource", EntryType.OUT, argMap);
```

热点参数埋点支持以 key-value 的方式传入参数，这样开发者可以无需像之前传入 args 一样关心参数顺序，从而更方便的配置热点规则（按照 key 来匹配即可，不需按参数匹配）。

热点规则的设计，以及 Entry API 的设计需要做相应的调整。

Start by reviewing the SphU.entry() API and the hotspot-rule design, since the issue names no files or tests. Clarify how key-value parameters should be represented and matched without relying on argument order; the work is done when the Entry API and hotspot rules support that behavior consistently.

Written by the indexing model from the issue text.