feat: close rpc connections when not in use

[hansieodendaal]

Description

Added the ability to close RPC connections for a given peer:

• Client-side:
  • When dialling a peer (in establishing a new connection), a drop old connections switch can be included in the client's dial request so that only one RPC client connection will ever be active.

Motivation and Context

Wallets keep on hitting their maximum allowed RPC sessions in the server.

How Has This Been Tested?

• Added new unit tests.
• System-level testing [TBD].

What process can a PR reviewer use to test or verify this change?

Code review

Breaking Changes

• [x] None
• [ ] Requires data directory on base node to be deleted
• [ ] Requires hard fork
• [ ] Other - Please specify

[github-actions[bot]]

Test Results (CI)

    2 files     86 suites   25m 27s ⏱️ 1 345 tests 1 345 ✅ 0 💤 0 ❌ 2 682 runs  2 682 ✅ 0 💤 0 ❌

Results for commit 3730921d.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Test Results (Integration tests)

0 tests   0 ✅  0s ⏱️ 0 suites  0 💤 0 files    0 ❌

Results for commit 3730921d.

:recycle: This comment has been updated with latest results.