Add to API to get a strategy during TSRemapNewInstance

[traeak]

This gives the API access to the RemapConfig url_mapping during TSRemapNewInstance calls. This contains both the assigned stragies pointer and a pointer to the loaded strategy factory.

This modifies the strategies ts API from the previous PR.

API is:

valid during TSRemapNewInstance:

TSStrategy TSRemapNextHopStrategyFind(const char *name);
TSStrategy TSRemapNextHopStrategyGet();
void TSRemapNextHopStrategySet(TSStrategy strategy);

valid during remap (the Find call is changed):

TSStrategy TSHttpTxnNextHopStrategyFind(TSHttpTxn txnp, const char *name);
TSStrategy TSHttpTxnNextHopStrategyGet(TSHttpTxn txnp);
void TSHttpTxnNextHopStrategySet(TSHttpTxn txnp, TSStrategy strategy);

with utility function to get the strategy name (returns "null" if nullptr strategy):

char const *TSNextHopStrategyNameGet(TSStrategy strategy);

The header_rewrite and regex_remap plugins are modified to look up named strategies during TSRemapNewInstance instead of performing strategy factory lookups during each transaction remap hook.

[Copilot]

Pull Request Overview

This PR refactors the next-hop strategy API to separate transaction-level and remap-level strategy operations, introducing new TSRemap* functions for use during TSRemapNewInstance. The API functions have been renamed for consistency and clarity.

• Renamed TSHttpNextHopStrategyNameGet to TSNextHopStrategyNameGet
• Renamed TSHttpTxnNextHopNamedStrategyGet to TSHttpTxnNextHopStrategyFind
• Added new TSRemap* API functions for strategy operations during remap rule loading

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/proxy/http/remap/RemapConfig.cc	Sets up url_mapping::instance for TSRemap* API access and assigns strategyFactory to new mappings
src/api/InkAPI.cc	Implements new TSRemap* functions and renames existing API functions
plugins/regex_remap/regex_remap.cc	Updates to use new TSRemapNextHopStrategyFind API during initialization
plugins/lua/ts_lua_http.cc	Updates function calls to use renamed API functions
plugins/header_rewrite/operators.h	Changes internal storage from Value to explicit strategy pointer
plugins/header_rewrite/operators.cc	Refactors to use TSRemapNextHopStrategyFind during initialization and removes runtime hook
plugins/header_rewrite/conditions.cc	Updates to use renamed TSNextHopStrategyNameGet function
include/ts/ts.h	Updates API documentation and function declarations
include/proxy/http/remap/UrlMapping.h	Adds strategyFactory pointer and static instance pointer to url_mapping
doc/developer-guide/api/functions/*.en.rst	Adds/updates documentation for new and renamed API functions

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