feat: added IS_MODULARIZED axios header for MirrorNodeClient

[quiet-node]

Description

This PR adds support for the Is-Modularized header in Mirror Node requests through a new configuration flag, USE_MIRROR_NODE_MODULARIZED_SERVICES, allowing controlled routing of traffic to modularized services within the Mirror Node.

Context

Currently, only a small percentage of Mirror Node traffic on Previewnet is routed to modularized services, with a gradual increase planned until full adoption across all networks.

For now, the Relay explicitly sets this to false to ensure traffic follows the non-modularized flow. Once the Mirror Node fully transitions, this will be updated to true as a default value.

Changes

• Added USE_MIRROR_NODE_MODULARIZED_SERVICES configuration flag (default: false)
• Modified request headers to include Is-Modularized with appropriate string conversion
• Updated documentation to reflect the new configuration option

Related issue(s):

Fixes #3623

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

Test Results

 22 files   -  1  298 suites  +20   34m 40s ⏱️ - 3m 1s
631 tests  -  1  622 ✅ + 2  4 💤 ±0  5 ❌  - 3 
839 runs   - 31  828 ✅  - 25  6 💤 +1  5 ❌  - 7 

For more details on these failures, see this check.

Results for commit fa4a3a5. ± Comparison against base commit 7077237.

This pull request removes 5 and adds 4 tests. Note that renamed tests count towards both.

"after all" hook in "RPC Server Acceptance Tests" ‑ RPC Server Acceptance Tests "after all" hook in "RPC Server Acceptance Tests"
"before all" hook for "should associate to a token" ‑ RPC Server Acceptance Tests Acceptance tests @tokencreate HTS Precompile Token Create Acceptance Tests "before all" hook for "should associate to a token"
"before all" hook for "should execute "eth_getCode" for hts token" ‑ RPC Server Acceptance Tests Acceptance tests @api-batch-2 RPC Server Acceptance Tests eth_getCode "before all" hook for "should execute "eth_getCode" for hts token"
"before all" hook in "RPC Server Acceptance Tests" ‑ RPC Server Acceptance Tests Acceptance tests @api-batch-1 RPC Server Acceptance Tests RPC Server Acceptance Tests "before all" hook in "RPC Server Acceptance Tests"
"before each" hook for "should execute "eth_getStorageAt" request to get current state changes" ‑ RPC Server Acceptance Tests Acceptance tests @api-batch-2 RPC Server Acceptance Tests "before each" hook for "should execute "eth_getStorageAt" request to get current state changes"

"after all" hook for "@release should execute "eth_estimateGas" for contract call, using a standard websocket" ‑ RPC Server Acceptance Tests Acceptance tests @web-socket-batch-1 eth_estimateGas "after all" hook for "@release should execute "eth_estimateGas" for contract call, using a standard websocket"
"before all" hook for "Function calling HederaTokenService.isToken(token)" ‑ RPC Server Acceptance Tests Acceptance tests @api-batch-3 RPC Server Acceptance Tests eth_call with contract that calls precompiles "before all" hook for "Function calling HederaTokenService.isToken(token)"
"before all" hook in "@tokenmanagement HTS Precompile Token Management Acceptance Tests" ‑ RPC Server Acceptance Tests Acceptance tests @tokenmanagement HTS Precompile Token Management Acceptance Tests "before all" hook in "@tokenmanagement HTS Precompile Token Management Acceptance Tests"
"before each" hook for "Should allow different accounts associated in the same HbarSpendingPlan to contribute to the same budget" ‑ RPC Server Acceptance Tests Acceptance tests @hbarlimiter HBAR Limiter Acceptance Tests HBAR Rate Limit Tests HBAR Rate Limit For Different Spending Plan Tiers @hbarlimiter-batch2 Preconfigured Tiers PRIVILEGED Tier "before each" hook for "Should allow different accounts associated in the same HbarSpendingPlan to contribute to the same budget"

♻️ This comment has been updated with latest results.

[Ferparishuertas]

LGTM

[natanasow]

LGTM!